Re: Cannot boot the real thing from HDD

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Hello Paul,

It is really too bad that you don't have any working FDD on your Amstrad PC, so that we could test if the latest fixes solve the "cannot boot the real thing from floppy" problem...

It would help a lot before attacking the HDD problem.

Anyway... there is a new payload in the 'bootblocks' folder, named 'probe.bin', that queries the BIOS for the actual geometry of the HDD. Could you please DD that payload to your CF first sectors (2) and give us what is displayed on boot ?

Thanks,

MFLD


Le 03/02/2020 à 17:59, Paul Osmialowski a écrit :
Hi Marc,

I gave it a go, it now looks differend, yet it still fails at the end:

Boot sector
...Linux found
..........................................4!
Press key

(number of dots in the longest line may differ from actual)

According to boot_err.h file, the error code 4 means ERR_BAD_SYSTEM

I looked into hd.bin image. It does seem to have correct minix fs with
/linux file of size 49778 bytes and /bin/init (instead of /sbin/init)
among other files and directories.

Good news with Amstrad PC 2086, I managed to fix its keyboard, it just
needed a good scrub. Now I can boot FreeDOS from a CF card and start
things like OpenGEM and alike.

Cheers,
Paul

On Sat, 1 Feb 2020, Marc-F. Lucca-Daniau wrote:

Hello Paul,

The problem should be solved now (at least for the floppy).

Details in the issues listed below (253 and 288).

MFLD


Le 30/01/2020 ? 22:43, Marc-F. Lucca-Daniau a écrit :
Hello Paul,

Thanks for the report, that time with the error code 3.

Your problem is still tracked by:
https://github.com/elks-org/elks/issues/253

It looks like you are facing the same problem as another user:
https://github.com/elks-org/elks/issues/288

We are now quite sure there is a somewhere a bug in the new `disk_read`
function, that fires only on real HW, not in QEmu.

Investigation is still ongoing... stay tuned !

MFLD



Le 30/01/2020 ? 20:51, Paul Osmialowski a écrit :
Hi Marc,

As I mentioned earlier, I'm again away from my old home and won't be there
before April (to make tests on my old XT-Turbo). Yet I managed to buy on
e-bay an Amstrad PC2086 here, so in theory, I should be able to continue
from here too. The machine itself came in a very bad shape, the keyboard
is broken, FDD and original MFM HDD are also dead. Fortunately, I've got
one more XT-IDE 8-bit ISA card and an CF-IDE adapter. It's the only
workable boot device this machine currently has.

I've compiled ELKS's recent git master and copied boot image to the 32MB
CF card. While configuring the build, some progess I've noticed in the way
HD image is configured (CHS geometry can now be given through menuconfig).

I tried to boot the image, but all I could see was:

MINIX boot
3!
Press key.

Some specs of this machine:

- CPU: AMD 8086
- RAM: 640kB
- Video: Onboard VGA Paradise
- Serial port: Onboard Amstrad 40049 inherited from Amstrad Portable PC
line (I hope it's compatible with 8250, not sure where to find more info
about it)
- Amstrad-specific keyboard and mouse (not compatible with anything else
and not repairable when broken)
- Onboard Zilog 765 floppy disk controller

I've removed MFM HDD controller (8-bit ISA card), as there's no use for
it.

Cheers,
Paul

On Fri, 24 Jan 2020, Marc-F. Lucca-Daniau wrote:

Hello Paul,

I added some error checking with very simple traces in my latest commit:
https://github.com/jbruchon/elks/commit/63647a9a37ec3c5751fb2adc4ddad368e18ba7c5

It would be nice if you (or someone else on that mailing list) could try
to
boot again from a floppy disk and report the traces in case of any
failure.

Also, I added some options to describe the HD geometry in the
configuration,
not to have to hack that part of code:
https://github.com/jbruchon/elks/commit/28d5f0ae66fd62bb7e25770e23d3c402cd301d76

And last but not least, the boot block now reuses the driver number as
provided by the BIOS, again to avoid forcing it in the code:
https://github.com/jbruchon/elks/commit/9dbcd5ace60dc19f1bad24e34f1a3dd8793bcfcf

MFLD


Le 22/12/2019 ? 11:51, Marc-F. Lucca-Daniau a écrit :
Hello Paul,

I forced the build of minix.bin to 8086 model (-mtune 8086), but no
change
in the binary, so not related to possible 80186/286 instructions.

Also, you memory is largely enough for the relocation of the code, so
not
related either (it could fail for memory < 128 Kb).

I am currently suspecting the INT 13h in disk_read() to fail at one
moment,
but as there is no error checking in load_zone() and in load_file() in
the
current version, it could be a silent error.

I am going to try to add that error checking in the remaining space of
the
second sector.

Stay tuned...

MFLD


Le 18/12/2019 ? 23:51, Paul Osmialowski a écrit :
Some more info:

CPU: 8088, no FPU installed (empty socket)
MEM: 640kB, no expansions
FDD: standard 765-based FDD controller on 8-bit ISA card
HDD: XT-CF IDE controller on 8-bit ISA card bought here:

https://www.lo-tech.co.uk/wiki/Lo-tech_ISA_CompactFlash_Adapter_revision_2b

with BIOS obtained from here:

https://code.google.com/archive/p/xtideuniversalbios

On Wed, 18 Dec 2019, Paul Osmialowski wrote:

Hi Marc,

Thanks for your quick reply. This machine is NOT an original IBM
PC/XT,
it
is a cheap Taiwan made clone from 1986, very popular Turbo XT.

Using simple Willem programmer I managed to dump its BIOS to a
file
(attached xt-rom.BIN file, 8192 bytes). When powered on it prints:

T U R B O - XT 1986
Speed 4.77/8.00MHz Version 3.10

Thanks,
Paul

On Wed, 18 Dec 2019, Marc-François Lucca-Daniau wrote:

Hello Paul,

I walked into the dump of your CF image, and everything looks
correct
: Minix boot blocks, geometry constants, filesystem, root
directory
and kernel image.

Could you please tell me the size of your low memory, and
confirm the
processor is a 8088/86, not a 80186/286 ? After reading the code
of
the boot blocks again, I found two potential failures related.

Also, if you could tell me the BIOS version & date, for me to
have a
look in the IBM manual ?

Thanks,

MFLD


Le mar. 17 déc. 2019 23:21, Paul Osmialowski
<pawelo@xxxxxxxxxxx> a
écrit :
         Hi Marc,

         The bzipped file is so small I'd try to attach it to
this
message.
         The other attachment is the diff of all of my changes.

         I must admit, I was looking into wrong places. As I
mounted
this image, it
         indeed contains MINIX filesystem with /linux file in it,
and
that file
         indeed has magic string "ELKS" at offset 0x1E6. So I
suspect,
load_zone()
         does something wrong.

         Note that I wasn't able to boot from 360k floppy either
(with
the same
         outcome!), despite all the changes as in the patch.

         Cheers,
         Paul

         On Tue, 17 Dec 2019, Marc-F. Lucca-Daniau wrote:

         > Hello Paul,
         >
         > I understand your mail on dec-16, but I don't the
latest
today.
         >
         > * minix_second.c loads the root directory, then finds
the
"/linux" file in it,
         > as you got the "Linux found!" trace.
         >
         > * the "linux" file is supposed to be the
/elks/arch/i86/boot/Image (see
         > image/Makefile):
         >
         > sudo install $(ELKS_DIR)/arch/i86/boot/Image
$(TARGET_MNT)/linux
         >
         > * that file concatenates 3 other files : bootsect,
setup and
system (through
         > the /elks/arch/i86/tools utility)
         >
         > * run_prog() checks that the "bootsect" file contains
"ELKS"
at offset 1E6h:
         >
         > minix_first.S:
         >     mov 0x01E6,%ax  // check for ELKS magic number
         >     cmp $0x4C45,%ax
         >     jnz not_elks
         >     mov 0x01E8,%ax
         >     cmp $0x534B,%ax
         >     jz  boot_it
         >
         > bootsect.S:
         > .org 0x1E3
         > msg1:
         >     .byte 13,10,7
         >     .ascii "ELKS Boot"
         >
         > * dumping the "Image" file on my machine shows that
the
offset and the string
         > are correct:
         >
         > 0001e0 12 0f 09 0d 0a 07 45 4c 4b 53 20 42 6f 6f 74 20
......ELKS Boot <
         >
         > * so I agree that the loaded file "linux" is not the
right
one in memory
         >
         > Could you please:
         >
         > 1) dump the "Image" file and check the data @ 1E0h ?
         >
         > 2) "DD" the content of your CF card to a file and
upload that
file to a
         > server, so that I could inspect the actual structure
of the
Minix filesystem
         > on your CF card ? I understood you flashed it with
fd1440.bin, but I would
         > like to see what the CF card contains at the end.
         >
         > Thanks,
         >
         > MFLD
         >
         >
         >
         >
         > Le 17/12/2019 ? 11:23, Paul Osmialowski a écrit :
         > > I've looked at the problem more closely and now I
see that
after
         > > "Revise bootblocks for GCC-IA16" commit
         > > (9e038b816014f83c0808df1ee5697380cd6be499) there's
no way
to boot ELKS on
         > > any real machine whatsoever. The magic number was
specified
in file
         > > sysboot16.s that this patch hapily removes. The
bootloader's run_prog()
         > > routine looks for non-existing thing. And even after
removal of that check,
         > > the bootloader stucks somewhere after boot_it label.
It
happens with hd,
         > > it happens with floppy. ELKS now can be used only
with
emulators and it's
         > > a regression comparing to what was possible last
year.
         > >
         > > On Mon, 16 Dec 2019, Paul Osmialowski wrote:
         > >
         > > > Hello MFLD,
         > > >
         > > > As I'm back to my old flat for a while, I can
follow this
up for couple of
         > > > days.
         > > >
         > > > I've made following changes in bootsector files:
         > > >
         > > > diff --git a/elkscmd/bootblocks/minix_first.S
         > > > b/elkscmd/bootblocks/minix_first.S
         > > > index c70625a6..cce72ba1 100644
         > > > --- a/elkscmd/bootblocks/minix_first.S
         > > > +++ b/elkscmd/bootblocks/minix_first.S
         > > > @@ -75,7 +75,8 @@ loopy:
         > > >          mov $0x0201,%ax    // read 1 sector
         > > >          mov $sector_2,%bx  // destination
         > > >          mov $2,%cx         // track 0 - from
sector 2
(base 1)
         > > > -       xor %dx,%dx        // drive 0 - head 0
         > > > +       mov $0x80,%dx      // head 0 - drive 0x80
         > > > +       // xor %dx,%dx // drive 0 - head 0
         > > >          int $0x13          // BIOS disk services
         > > >          jc loopy
         > > >          jmp _next2
         > > > @@ -250,7 +251,7 @@ drive_reset:
         > > >   // #undef CONFIG_IMG_FD360
         > > >     sect_max:
         > > > -#ifdef CONFIG_IMG_FD720
         > > > +#if defined(CONFIG_IMG_FD360) ||
defined(CONFIG_IMG_FD720)
         > > >          .word 9
         > > >   #endif
         > > >   #if defined(CONFIG_IMG_FD1200)
         > > > @@ -262,11 +263,17 @@ sect_max:
         > > >   #if defined(CONFIG_IMG_FD1680)
         > > >          .word 21
         > > >   #endif
         > > > +#if defined(CONFIG_IMG_HD)
         > > > +       .word 61
         > > > +#endif
         > > >     head_max:
         > > >   #if defined(CONFIG_IMG_FD1440) ||
defined(CONFIG_IMG_FD720) ||
         > > > defined(CONFIG_IMG_FD360) ||
defined(CONFIG_IMG_FD1200)
||
         > > > defined(CONFIG_IMG_FD1680)
         > > >          .word 2
         > > >   #endif
         > > > +#if defined(CONFIG_IMG_HD)
         > > > +       .word 1
         > > > +#endif
         > > >     track_max:
         > > >   #if defined(CONFIG_IMG_FD360)
         > > > @@ -275,6 +282,9 @@ track_max:
         > > >   #if defined(CONFIG_IMG_FD1440) ||
defined(CONFIG_IMG_FD720)
         > > >          .word 80
         > > >   #endif
         > > > +#if defined(CONFIG_IMG_HD)
         > > > +       .word 1024
         > > > +#endif
         > > >
   //------------------------------------------------------------------------------
         > > >   diff --git a/elkscmd/bootblocks/minix_second.c
         > > > b/elkscmd/bootblocks/minix_second.c
         > > > index f33c6139..9fd3e6d2 100644
         > > > --- a/elkscmd/bootblocks/minix_second.c
         > > > +++ b/elkscmd/bootblocks/minix_second.c
         > > > @@ -74,7 +74,7 @@ static int load_super ()
         > > >          int err;
         > > >            while (1) {
         > > > -               err = disk_read (0, 2, 2,
sb_block,
seg_data ());
         > > > +               err = disk_read (0x80, 2, 2,
sb_block,
seg_data ());
         > > >                  //if (err) break;
         > > >                    sb_data = (struct super_block
*)
sb_block;
         > > > @@ -116,7 +116,7 @@ static int load_inode ()
         > > >                  // Compute inode block and load
if not
cached
         > > >                    int ib = ib_first + i_now /
INODES_PER_BLOCK;
         > > > -               err = disk_read (0, ib << 1, 2,
i_block,
seg_data ());
         > > > +               err = disk_read (0x80, ib << 1, 2,
i_block, seg_data ());
         > > >                  //if (err) break;
         > > >                    // Get inode data
         > > > @@ -137,12 +137,12 @@ static int load_zone (int
level,
zone_nr * z_start,
         > > > zone_nr * z_end)
         > > >          for (zone_nr * z = z_start; z < z_end;
z++) {
         > > >                  if (level == 0) {
         > > >                          // FIXME: image can be >
64K
         > > > -                       err = disk_read (0, (*z)
<< 1, 2,
i_now ? f_pos :
         > > > d_dir + f_pos, i_now ? LOADSEG : seg_data ());
         > > > +                       err = disk_read (0x80,
(*z) << 1,
2, i_now ? f_pos
         > > > : d_dir + f_pos, i_now ? LOADSEG : seg_data ());
         > > >                          f_pos += BLOCK_SIZE;
         > > >                          if (f_pos >=
i_data->i_size)
break;
         > > >                  } else {
         > > >                          int next = level - 1;
         > > > -                       err = disk_read (0, *z <<
1, 2,
z_block [next],
         > > > seg_data ());
         > > > +                       err = disk_read (0x80, *z
<< 1,
2, z_block [next],
         > > > seg_data ());
         > > > load_zone (next, (zone_nr *)
z_block [next],
         > > > (zone_nr *) (z_block [next] + BLOCK_SIZE));
         > > >                  }
         > > >          }
         > > > @@ -227,7 +227,7 @@ void main ()
         > > >                    for (int d = 0; d <
i_data->i_size; d
+= DIRENT_SIZE) {
         > > >                          if (!strcmp (d_dir + 2 +
d,
"linux")) {
         > > > -  //puts ("Linux
found\r\n");
         > > > +  puts ("Linux found\r\n");
         > > >   i_now = (*(int *)(d_dir
+ d)) - 1;
         > > > load_file ();
         > > > run_prog ();
         > > >
         > > > Summary is following:
         > > >
         > > > - added missing check for CONFIG_IMG_FD360
(definitely,
should be fixed
         > > > upstream too!)
         > > > - hardcoded HD C/H/S geometry with values outputed
by
'fdisk -c=dos' :
         > > > 1024/1/61 (~32MB CF card)
         > > > - "Linux found" is printed when certain point in
main()
is reached (helps
         > > > with investigation)
         > > > - Disk drive is ensured 0x80 wherever I've managed
to
find it should be
         > > > hardcoded.
         > > >
         > > > Result:
         > > >
         > > > MINIX boot
         > > > Linux found
         > > > Not ELKS!
         > > >
         > > > So it seems we have a small progress comparing to
last
attempt: sector 2
         > > > is read, main() gets executed, and run_prog() gets
called. Yet run_prog()
         > > > finds that what was read from storage wasn't the
thing
that was expected
         > > > (does it look for "EL" at the right offset?!). I
suspect
something went
         > > > wrong with load_file(). Any hints welcomed.
         > > >
         > > > Thanks,
         > > > Paul
         > > >
         > > > On Sun, 21 Apr 2019, Marc-F. Lucca-Daniau wrote:
         > > >
         > > > > Hello Paul,
         > > > >
         > > > > Yes, all your testing is consistent, and really
help to
know where to
         > > > > improve
         > > > > the ELKS boot for real HW. Thanks for that !
         > > > >
         > > > > Let us plan that improvement for the next
commits...
         > > > >
         > > > > Thanks,
         > > > >
         > > > > MFLD
         > > > >
         > > > >
         > > > > Le 18/04/2019 ? 13:48, Paul Osmialowski a
écrit :
         > > > > > Hello,
         > > > > >
         > > > > > Booting fd1140.bin from CF card didn't help,
from
visible point of
         > > > > > view,
         > > > > > I'm observing the same behaviour, "MINIX boot"
on
screen and FDD led
         > > > > > blinking.
         > > > > >
         > > > > > I also did some confirmation test and changed
mov
$0x80,%dx back to
         > > > > > xor
         > > > > > %dx,%dx and indeed, "Sector 2!" appeared again
(with
FDD led
         > > > > > blinking), so
         > > > > > at least symptoms are consistent. There must
be
something FDD-bound
         > > > > > between sector_2 and disk_read(0x80,...) calls
in
minix_second.c.
         > > > > >
         > > > > > On Thu, 18 Apr 2019, Marc-F. Lucca-Daniau
wrote:
         > > > > >
         > > > > > > Hello,
         > > > > > >
         > > > > > > For a "flat volume", please DD the
'fd1440.bin' on
your CF, don't
         > > > > > > use the
         > > > > > > 'HD'
         > > > > > > image & option, I added it to the ELKS
configuration, but it is not
         > > > > > > completed
         > > > > > > & tested (see issue #199).
         > > > > > >
         > > > > > > Thanks,
         > > > > > >
         > > > > > > MFLD
         > > > > > >
         > > > > > >
         > > > > > > Le 17/04/2019 ? 23:12, Paul Osmialowski a
écrit :
         > > > > > > > Hi Marc,
         > > > > > > >
         > > > > > > > So I changed minix_first.S as such:
         > > > > > > >
         > > > > > > > @@ -68,7 +68,7 @@ _next1:
         > > > > > > > mov $0x0201,%ax    // read 1 sector
         > > > > > > > mov $sector_2,%bx  // destination
         > > > > > > > mov $2,%cx         // track 0 - from
sector 2 (base 1)
         > > > > > > > -       xor %dx,%dx        // drive 0 -
head 0
         > > > > > > > +       mov $0x80,%dx      // head 0 -
drive 0x80
         > > > > > > > int $0x13          // BIOS disk
services
         > > > > > > > jnc _next2
         > > > > > > >
         > > > > > > > And placed hd.img directly to /dev/hda (so
now
there's no
         > > > > > > > partition
         > > > > > > > table,
         > > > > > > > and no MBR written by FreeDOS). Now,
"MINIX boot"
appears on
         > > > > > > > screen,
         > > > > > > > which
         > > > > > > > is a good sign, but, FDD led is blinking
and
nothing else happens,
         > > > > > > > Ctrl-Alt-Del doesn't reboot, power-off is
the
only option.
         > > > > > > > Something
         > > > > > > > else
         > > > > > > > in between sector_2 and minix_second.c is
hard-coded for trying to
         > > > > > > > access
         > > > > > > > FDD...
         > > > > > > >
         > > > > > > > On Wed, 17 Apr 2019, Marc-F. Lucca-Daniau
wrote:
         > > > > > > >
         > > > > > > > > Hello Paul,
         > > > > > > > >
         > > > > > > > > I should have asked that question before
all :
is your CF card
         > > > > > > > > partitioned
         > > > > > > > > ?
         > > > > > > > >
         > > > > > > > > In the boot sector, the 'disk_read'
procedure
computes the CHS
         > > > > > > > > for the
         > > > > > > > > BIOS
         > > > > > > > > routines from the absolute sector
number.
         > > > > > > > >
         > > > > > > > > But today that procedure does not offset
that
number based on
         > > > > > > > > the
         > > > > > > > > partition
         > > > > > > > > absolute first sector (it is planned for
issue
#199).
         > > > > > > > >
         > > > > > > > > So it cannot work on a partitioned disk,
because even if you
         > > > > > > > > force the
         > > > > > > > > drive
         > > > > > > > > number to 0x80, and succeed to load the
second
sector (the MINIX
         > > > > > > > > boot
         > > > > > > > > loader
         > > > > > > > > in C), the 'disk_read' procedure won't
offset
the relative
         > > > > > > > > sector
         > > > > > > > > numbers
         > > > > > > > > given by the C code, and the parsing of
the
file system will
         > > > > > > > > fail
         > > > > > > > > after
         > > > > > > > > some
         > > > > > > > > times.
         > > > > > > > >
         > > > > > > > > Maybe a more simple test with a single
volume
on your CF card,
         > > > > > > > > before
         > > > > > > > > improving the procedure to support
partitioning
?
         > > > > > > > >
         > > > > > > > > Thank you for your testing !
         > > > > > > > >
         > > > > > > > > MFLD
         > > > > > > > >
         > > > > > > > >
         > > > > > > > > Le 16/04/2019 ? 23:18, Paul Osmialowski
a
écrit :
         > > > > > > > > > Hi Marc,
         > > > > > > > > >
         > > > > > > > > > Thanks for the hints. Feels like
disk-bootable ELKS is getting
         > > > > > > > > > closer,
         > > > > > > > > > but
         > > > > > > > > > we're still not there yet. I've
changed first
param of all
         > > > > > > > > > occurrences
         > > > > > > > > > of
         > > > > > > > > > disk_read in minix_second.c to 0x80,
unfortunately, it still
         > > > > > > > > > behaves
         > > > > > > > > > the
         > > > > > > > > > same way: as "MINIX boot" is
displayed, the
led on the first
         > > > > > > > > > FDD
         > > > > > > > > > blinks
         > > > > > > > > > and nothing happens, "Sector 2!" and
"Press
key" pops up
         > > > > > > > > > again. I
         > > > > > > > > > guess
         > > > > > > > > > this is the reason (in minix_first.S):
         > > > > > > > > >
         > > > > > > > > > _next1:
         > > > > > > > > >
         > > > > > > > > >  mov $msg_head,%bx
         > > > > > > > > >  call _puts
         > > > > > > > > >
         > > > > > > > > >  // Load the second sector of the boot
block
         > > > > > > > > >
         > > > > > > > > >  mov $0x0201,%ax    // read 1 sector
         > > > > > > > > >  mov $sector_2,%bx  // destination
         > > > > > > > > >  mov $2,%cx         // track 0 - from
sector 2
         > > > > > > > > > (base 1)
         > > > > > > > > >  xor %dx,%dx        // drive 0 - head
0
         > > > > > > > > >  int $0x13          // BIOS disk
services
         > > > > > > > > >  jnc _next2
         > > > > > > > > >           mov $msg_load,%bx
         > > > > > > > > >  call _puts
         > > > > > > > > >
         > > > > > > > > > // void reboot ()
         > > > > > > > > >
         > > > > > > > > >  .global reboot
         > > > > > > > > >
         > > > > > > > > > reboot:
         > > > > > > > > >
         > > > > > > > > >  mov $msg_reboot,%bx
         > > > > > > > > >  call _puts
         > > > > > > > > >  xor %ax,%ax  // wait for key
         > > > > > > > > >  int $0x16
         > > > > > > > > >  int $0x19
         > > > > > > > > >  jmp reboot
         > > > > > > > > >
         > > > > > > > > > I tried to make some changes to it.
Note that
now I'm using
         > > > > > > > > > 32MB CF
         > > > > > > > > > card
         > > > > > > > > > with geometry 60 tracks per head, 16
heads,
63 sectors per
         > > > > > > > > > track.
         > > > > > > > > > Using
         > > > > > > > > > hexviewer I've found that the boot
partition
starts at byte
         > > > > > > > > > 0x7e00
         > > > > > > > > > on the CF card (first sector of the
second
track), so sector_2
         > > > > > > > > > is at
         > > > > > > > > > byte
         > > > > > > > > > 0x8000 on the CF card (assuming that
the
thing I should look
         > > > > > > > > > for is
         > > > > > > > > > the
         > > > > > > > > > same as I can find at byte 512 of
hd.img). So
I modified
         > > > > > > > > > minix_first.S
         > > > > > > > > > as
         > > > > > > > > > such:
         > > > > > > > > >
         > > > > > > > > > -  mov $2,%cx         // track 0 -
from
sector 2 (base 1)
         > > > > > > > > > -  xor %dx,%dx        // drive 0 -
head 0
         > > > > > > > > > +  mov $0x42,%cx      // track 1 -
from
sector 2 (base 1)
         > > > > > > > > > +  mov $0x80,%dx      // head 0 -
drive 0x80
         > > > > > > > > > (CX: assuming 6 bits for sector, track
1
should be 0x40)
         > > > > > > > > >
         > > > > > > > > > Unfortunately, the only real change is
that
FDD does not blink
         > > > > > > > > > anymore.
         > > > > > > > > > After a longer while of waiting
"Secotr 2!"
and "Press key"
         > > > > > > > > > still
         > > > > > > > > > pops
         > > > > > > > > > out.
         > > > > > > > > >
         > > > > > > > > >
         > > > > > > > > > On Tue, 16 Apr 2019, Marc-F.
Lucca-Daniau
wrote:
         > > > > > > > > >
         > > > > > > > > > > Hello Paul,
         > > > > > > > > > >
         > > > > > > > > > > Sounds good, because if you see
"MINIX
boot" message when
         > > > > > > > > > > booting
         > > > > > > > > > > from
         > > > > > > > > > > your
         > > > > > > > > > > HD/CF, and if you can mount it when
booting
from the floppy,
         > > > > > > > > > > it
         > > > > > > > > > > means
         > > > > > > > > > > there
         > > > > > > > > > > are only a few changes left to make
it
fully working.
         > > > > > > > > > >
         > > > > > > > > > > Did you tried to hack the 3
variables
'sect_max', 'head_max'
         > > > > > > > > > > and
         > > > > > > > > > > 'track_max'
         > > > > > > > > > > in
'elkscmd/bootblocks/minix_first.S' with
the geometry as
         > > > > > > > > > > presented
         > > > > > > > > > > by
         > > > > > > > > > > your
         > > > > > > > > > > adapter (123 / 16 / 6) ?
         > > > > > > > > > >
         > > > > > > > > > > Also, in
'elkscmd/bootblocks/minix_second.c', the boot drive
         > > > > > > > > > > number is
         > > > > > > > > > > forced
         > > > > > > > > > > to 0 when calling 'disk_read' (as
first
argument), so the
         > > > > > > > > > > MINIX
         > > > > > > > > > > boot
         > > > > > > > > > > loader
         > > > > > > > > > > has to be improved to use the right
one
provided by the
         > > > > > > > > > > BIOS.
         > > > > > > > > > > Meantime,
         > > > > > > > > > > you
         > > > > > > > > > > can also hack that file and set that
argument to 0x80 (=
         > > > > > > > > > > first
         > > > > > > > > > > hard
         > > > > > > > > > > drive)
         > > > > > > > > > > for
         > > > > > > > > > > you experiment.
         > > > > > > > > > >
         > > > > > > > > > > MFLD
         > > > > > > > > > >
         > > > > > > > > > >
         > > > > > > > > > > Le 15/04/2019 ? 18:12, Paul
Osmialowski a
écrit :
         > > > > > > > > > > > Just one more observation. I
managed to
mount minix
         > > > > > > > > > > > filesystem
         > > > > > > > > > > > from
         > > > > > > > > > > > CF
         > > > > > > > > > > > Card on system booted from 360k
floppy!
And not using
         > > > > > > > > > > > directhd
         > > > > > > > > > > > driver at
         > > > > > > > > > > > all! My mistake was, I tried to
mount
/dev/hda1 while the
         > > > > > > > > > > > partition
         > > > > > > > > > > > is
         > > > > > > > > > > > at
         > > > > > > > > > > > /dev/bda1
         > > > > > > > > > > >
         > > > > > > > > > > > I've noticed, chroot command would
be a
great help.
         > > > > > > > > > > >
         > > > > > > > > > > > Cheers again,
         > > > > > > > > > > > Paul
         > > > > > > > > > > >
         > > > > > > > > > > > On Mon, 15 Apr 2019, Paul
Osmialowski
wrote:
         > > > > > > > > > > >
         > > > > > > > > > > > > Hi Marc,
         > > > > > > > > > > > >
         > > > > > > > > > > > > Thanks for your response. I've
noticed
a few interesting
         > > > > > > > > > > > > things
         > > > > > > > > > > > > btw.
         > > > > > > > > > > > >
         > > > > > > > > > > > > I've found lots of #ifdef
HARDDISK in
this new boot
         > > > > > > > > > > > > sector
         > > > > > > > > > > > > code,
         > > > > > > > > > > > > so I
         > > > > > > > > > > > > decided to give it a try. I've
placed
this boot sector
         > > > > > > > > > > > > code in
         > > > > > > > > > > > > /dev/hda1 (leaving original
FreeDOS MBR
in /dev/hda) and
         > > > > > > > > > > > > for a
         > > > > > > > > > > > > first
         > > > > > > > > > > > > time
         > > > > > > > > > > > > I've noticed something is alive:
"MINIX
boot" appeared
         > > > > > > > > > > > > on
         > > > > > > > > > > > > screen
         > > > > > > > > > > > > when
         > > > > > > > > > > > > I
         > > > > > > > > > > > > booted from CF Card! But that's
all,
the next thing it
         > > > > > > > > > > > > tried
         > > > > > > > > > > > > to do
         > > > > > > > > > > > > was
         > > > > > > > > > > > > to
         > > > > > > > > > > > > access floppy disk drive, having
it
empty, I could only
         > > > > > > > > > > > > see
         > > > > > > > > > > > > "Press
         > > > > > > > > > > > > key"
         > > > > > > > > > > > > and it rebooted itself after
pressing
any key. I guess
         > > > > > > > > > > > > my
         > > > > > > > > > > > > XT-IDE
         > > > > > > > > > > > > card
         > > > > > > > > > > > > is
         > > > > > > > > > > > > not handled properly, although
when I
boot ELKS from
         > > > > > > > > > > > > floppy I
         > > > > > > > > > > > > can
         > > > > > > > > > > > > see
         > > > > > > > > > > > > this
         > > > > > > > > > > > > on the serial console:
         > > > > > > > > > > > >
         > > > > > > > > > > > > hd Driver Copyright (C) 1994
Yggdrasil
Computing, Inc.
         > > > > > > > > > > > >
                       Extended
         > > > > > > > > > > > > and modified for Liux 8086 by
Alan Cox.
         > > > > > > > > > > > >
      doshd:
         > > > > > > > > > > > > 2 floppy drives and 1 hard drive
         > > > > > > > > > > > >
                                             /dev/hda:
         > > > > > > > > > > > > 123 cylindrs, 16 heads, 6
sectors =
60.5 Mb
         > > > > > > > > > > > >
         > > > > > > > > > > > > (that's when 64MB FreeDOS CF
Card is
inserted)
         > > > > > > > > > > > >
         > > > > > > > > > > > > Also, before the ELKS boot
starts I can
see this:
         > > > > > > > > > > > >
         > > > > > > > > > > > > XTIDE Universal BIOS (XT) @
C800h
         > > > > > > > > > > > > Master at 300h: CF Card
         > > > > > > > > > > > > Slave  at 300h: not found
         > > > > > > > > > > > >
         > > > > > > > > > > > > I've tried to compile directhd
driver,
but it lacks
         > > > > > > > > > > > > #include
         > > > > > > > > > > > > <arch/io.h>
         > > > > > > > > > > > > causing link-time issue as some
of the
macros defined
         > > > > > > > > > > > > there
         > > > > > > > > > > > > are
         > > > > > > > > > > > > mistaken
         > > > > > > > > > > > > for functions (outb_p() and
friends),
adding missing
         > > > > > > > > > > > > #include
         > > > > > > > > > > > > <arch/io.h>
         > > > > > > > > > > > > makes whole thing buildable, yet
it
still doesn't seem
         > > > > > > > > > > > > to make
         > > > > > > > > > > > > any
         > > > > > > > > > > > > (visible) difference.
         > > > > > > > > > > > >
         > > > > > > > > > > > > Cheers,
         > > > > > > > > > > > > Paul
         > > > > > > > > > > > >
         > > > > > > > > > > > > On Sun, 14 Apr 2019, Marc-F.
Lucca-Daniau wrote:
         > > > > > > > > > > > >
         > > > > > > > > > > > > > Hello,
         > > > > > > > > > > > > >
         > > > > > > > > > > > > > Not a surprise, as the new
code has
only been tested
         > > > > > > > > > > > > > on 1.44
         > > > > > > > > > > > > > MB
         > > > > > > > > > > > > > floppy.
         > > > > > > > > > > > > >
         > > > > > > > > > > > > > Looks like there is a missing
"#ifdef
FD360" in the
         > > > > > > > > > > > > > boot
         > > > > > > > > > > > > > sector
         > > > > > > > > > > > > > new
         > > > > > > > > > > > > > code...
         > > > > > > > > > > > > >
         > > > > > > > > > > > > > Now tracked by issue
         > > > > > > > > > > > > >
https://github.com/jbruchon/elks/issues/253
         > > > > > > > > > > > > >
         > > > > > > > > > > > > > Thanks for the report,
         > > > > > > > > > > > > >
         > > > > > > > > > > > > > MFLD
         > > > > > > > > > > > > >
         > > > > > > > > > > > > >
         > > > > > > > > > > > > > Le 14/04/2019 ? 19:46, Paul
Osmialowski a écrit :
         > > > > > > > > > > > > > > Hi,
         > > > > > > > > > > > > > >
         > > > > > > > > > > > > > > I'm having access to my old
XT for
next couple of
         > > > > > > > > > > > > > > days so
         > > > > > > > > > > > > > > I
         > > > > > > > > > > > > > > decided to
         > > > > > > > > > > > > > > give the latest ELKS a go.
Since I
still don't know
         > > > > > > > > > > > > > > how to
         > > > > > > > > > > > > > > boot it
         > > > > > > > > > > > > > > from
         > > > > > > > > > > > > > > CF-IDE card (I can boot
FreeDOS
from it), I'm still
         > > > > > > > > > > > > > > booting it
         > > > > > > > > > > > > > > from
         > > > > > > > > > > > > > > 360k
         > > > > > > > > > > > > > > floppy. Unfortunately,
nowadays it
only prints MINIX
         > > > > > > > > > > > > > > and
         > > > > > > > > > > > > > > reboots
         > > > > > > > > > > > > > > itself
         > > > > > > > > > > > > > > after a while.
         > > > > > > > > > > > > > >
         > > > > > > > > > > > > > > I managed to make it boot
again
after reverting
         > > > > > > > > > > > > > > following
         > > > > > > > > > > > > > > commits
         > > > > > > > > > > > > > > on
         > > > > > > > > > > > > > > master:
         > > > > > > > > > > > > > >
         > > > > > > > > > > > > > >
93b57f474cb0e3fa9917b4783781cd405c944b04 [libc] Data
         > > > > > > > > > > > > > > segment
         > > > > > > > > > > > > > > starts
         > > > > > > > > > > > > > > with
         > > > > > > > > > > > > > > nil data
         > > > > > > > > > > > > > >
9e038b816014f83c0808df1ee5697380cd6be499 Revise
         > > > > > > > > > > > > > > bootblocks
         > > > > > > > > > > > > > > for
         > > > > > > > > > > > > > > GCC-IA16
         > > > > > > > > > > > > > >
         > > > > > > > > > > > > > > (the first one is reverted
mostrly
to reduce
         > > > > > > > > > > > > > > conflicts
         > > > > > > > > > > > > > > when
         > > > > > > > > > > > > > > reverting
         > > > > > > > > > > > > > > the
         > > > > > > > > > > > > > > other one).
         > > > > > > > > > > > > > >
         > > > > > > > > > > > > > > I guess something went wrong
with
implementing new
         > > > > > > > > > > > > > > features.
         > > > > > > > > > > > > > >
         > > > > > > > > > > > > > > Cheers,
         > > > > > > > > > > > > > > Paul
         > > > > > > > > > > > > > >
         > > > > > > > > > > > > > >
         >






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