On Thu, Apr 27, 2006 at 05:49:48PM +0200, Rodolfo Giometti wrote:
>
> I noticed that the serial lines management code is changed from
> linux-2.6.12 and I'd like to know if someone is running the serial
> console on ttyS0 on au1100...
Modifying the printk() code and sending the output directly to the
serial line (without using the driver since u-boot already init the
serial port for me) I get:
<4>Synthesized TLB store handler fastpath (34 instructions).
<4>Synthesized TLB modify handler fastpath (33 instructions).
<4>PID hash table entries: 512 (order: 9, 2048 bytes)
<4>calculating r4koff... 00060ae0(396000)
<4>CPU frequency 396.00 MHz
<4>Break instruction in kernel code[#1]:
<4>Cpu 0
<4>$ 0 : 00000000 1000fc00 0fffff00 00010000
<4>$ 4 : 803bfd30 00000000 8036dbe0 803bfd70
<4>$ 8 : 8036dbe0 00000000 00000000 1000fc01
<4>$12 : 803c0000 fffffffe ffffffff 0000000a
<4>$16 : 803b1b78 803b1b80 83fc4000 83fb12e0
<4>$20 : a3eb4462 00000000 83fc4000 00000000
<4>$24 : 00000000 80363e1b
<4>$28 : 80362000 80363f30 83fc4000 803a9a88
<4>Hi : 00000000
<4>Lo : 00030570
<4>epc : 80129a0c acquire_console_sem+0xd4/0xf0 Not tainted
<4>ra : 803a9a88 con_init+0x24/0x2a0
<4>Status: 1000fc03 KERNEL EXL IE
<4>Cause : 00800024
<4>PrId : 02030204
<4>Modules linked in:
<4>Process swapper (pid: 0, threadinfo=80362000, task=80364000)
<4>Stack : 83fc4000 803a42d4 00000000 00000800 803a9a88 179a7b00 83fc4000
83fb12e0
<4> a3eb4462 00000000 83fc4000 00000000 803b1b78 803b1b80 83fc4000
83fb12e0
<4> a3eb4462 00000000 803a8f58 803b0000 83fc4000 0000018c 00000000
431bde83
<4> 83fb4000 803b0000 8039479c 8039475c 80338f5c 803b4004 80366244
00000000
<4> 80394134 00000000 803b4e2c 00000000 83fb4000 83fb4000 83fb1aac
00000000
<4>
<4>Call Trace:
<4> [<803a42d4>] __alloc_bootmem_nopanic+0x68/0xb0
<4> [<803a9a88>] con_init+0x24/0x2a0
<4> [<803a8f58>] console_init+0x48/0x68
<4> [<8039479c>] start_kernel+0x194/0x3b4
<4> [<8039475c>] start_kernel+0x154/0x3b4
<4> [<80394134>] unknown_bootoption+0x0/0x304
<4>
<4>
<4>Code: 00000040 0804a664 00000000 <0200000d> 0804a657 3c03803b
0c0ca698 00000000 0804a667
<0>Kernel panic - not syncing: Aiee, killing interrupt handler!
So the problem seems to be the "acquire_console_sem()" into
"con_init()" function (file «drivers/char/vt.c»).
Suggestions? How is possible that the serial console code is buggy?
=:-o
Ciao,
Rodolfo
--
GNU/Linux Solutions e-mail: giometti@enneenne.com
Linux Device Driver giometti@gnudd.com
Embedded Systems giometti@linux.it
UNIX programming phone: +39 349 2432127
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