Hi,
I'm trying to get MTD support working on my embedded sparc (leon3, V8).
There are 32MB of flash on the board I want to utilize starting at 0x0. The
corresponding kernel options are:
CONFIG_MTD_PHYSMAP=y
CONFIG_MTD_PHYSMAP_START=0x00000000
CONFIG_MTD_PHYSMAP_LEN=0x02000000
With these options the kernel stops booting with
"alloc_io_res(phys_00000000): cannot occupy".
So I changed IOBASE_END and VMALLOC_START from 0xfe600000 to 0xff400000 in
include/asm-sparc/vaddrs.h. And voila, the kernel boots fine. But when I Try
to access the flash with dd the following happens:
Unable to handle kernel paging request at virtual address fe640000
tsk->{mm,active_mm}->context = 000000ae
tsk->{mm,active_mm}->pgd = fc01f400
\|/ ____ \|/
"@'/ ,. \`@"
/_| \__/ |_\
\__U_/
dd(2616): Oops [#1]
PSR: f30000c2 PC: f01b543c NPC: f01b5440 Y: 00000000 Not tainted
PC: <cfi_intelext_read+0x158/0x1b4>
%G: fbd77d70 00000000 00000000 fe640000 00000000 00000000 fbd76000
00000000
%O: 00000000 00000000 01640000 00000000 00032000 01640000 fbd77d78
f01b53dc
RPC: <cfi_intelext_read+0xf8/0x1b4>
%L: 00000200 00000000 f0034ce4 01640000 f0ae39e0 f0b0c3e4 fbd76000
0005d000
%I: 00000000 01640000 f0ae3a18 00000200 fbd77e64 fbd16200 fbd77de0
f01ad1c0
Caller[f01ad1c0]: mtd_read+0xf8/0x23c
Caller[f007607c]: vfs_read+0x9c/0x140
Caller[f0076598]: sys_read+0x38/0x64
Caller[f0011310]: syscall_is_too_hard+0x3c/0x40
Caller[00011b20]: 0x11b28
Instruction DUMP: c405600c 86008013 84102000 <c208c002> c228801d 8400a001
80a08010 12bffffc 94100019
Thanks,
-jan
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