Re: Cannot boot the real thing from HDD

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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 à 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 à 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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