hi,
I decided to play around with all the new shiny stuff in 2.6.17-rc6-mm2,
and tried to build a nearly allyesconfig kernel. After some tries,
I got to the point where it still runs after uncompressing, and got
into a panic.
[ 31.270647] Photron PNC-2000 flash mapping: 400000 at bf000000
[ 31.270737] BUG: unable to handle kernel paging request at virtual address bf000000
[ 31.270869] printing eip:
[ 31.270925] c09d516e
[ 31.270996] *pde = 00000000
[ 31.271051] Oops: 0002 [#1]
[ 31.271120] 4K_STACKS PREEMPT
[ 31.271270] last sysfs file:
[ 31.271340] Modules linked in:
[ 31.271453] CPU: 0
[ 31.271454] EIP: 0060:[<c09d516e>] Not tainted VLI
[ 31.271456] EFLAGS: 00010286 (2.6.17-rc6-mm2 #7)
[ 31.271652] EIP is at simple_map_write+0x4f/0x76
[ 31.271737] eax: f0f0f0f0 ebx: c12ed720 ecx: 00000000 edx: 00000020
[ 31.271798] esi: dffd19e0 edi: bf000000 ebp: dffd1a0c esp: dffd19e0
[ 31.271885] ds: 007b es: 007b ss: 0068
[ 31.271941] Process idle (pid: 1, threadinfo=dffd1000 task=dff86b40)
[ 31.272032] Stack: f0f0f0f0 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 31.272544] dffd1dd8 c09d511f dffd1dd8 dffd1f04 c09be78e f0f0f0f0 00000000 00000000
[ 31.273055] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000004
[ 31.273563] Call Trace:
[ 31.277555] [<c09be78e>] cfi_probe_chip+0x17a/0x13b0
[ 31.281571] [<c09d11c0>] mtd_do_chip_probe+0x73/0x323
[ 31.285518] [<c09be612>] cfi_probe+0xd/0xf
[ 31.289447] [<c09be1a3>] do_map_probe+0x3b/0xbc
[ 31.293376] [<c190e6ab>] init_pnc2000+0x30/0x60
[ 31.297311] [<c01002a1>] init+0x81/0x1df
[ 31.297476] [<c0101005>] kernel_thread_helper+0x5/0xb
[ 31.303646] Code: f8 01 75 0b 0f b6 45 d4 03 7b 0c 88 07 eb 35 83 f8 02 75 0c 0f b7 45 d4 03
7b 0c 66 89 07 eb 24 83 f8 04 75 0a 03 7b 0c 8b 45 d4 <89> 07 eb 15 7e 13 89 c1 03 7b 0c c1 e9
02 f3 a5 89 c1 83 e1 03
[ 31.306933] EIP: [<c09d516e>] simple_map_write+0x4f/0x76 SS:ESP 0068:dffd19e0
[ 31.307120] <0>Kernel panic - not syncing: Attempted to kill init!
[ 31.307241]
it seems the offendling line is in include/linux/map.h where inline_map_write()
calls __raw_writel(datum.x[0], map->virt + ofs);
due to some inlines not all calls show up here.. basically cfi_probe_chip()
calls cfi_send_gen_cmd() in cfi.h which calls map_write() which in turn
calls inline_map_write(). Since eax is filles with 0xF0 i guess it is
the first call to cfi_send_gen_cmd() in cfi_probe_chip()
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
Greetings, Eric
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