I found where is the failure with your advices <br>
In init_dev (tty_io.c), init_dev calls "tty = driver->ttys[idx]"<br>
after this call, tty value is : tty = 0x57555541<br>
<br>
Have I to initialize driver->ttys in my driver. If yes, how have I to Initialize this ?<br>
<br>
The driver tty is used in order to have a console on my serial port.<br>
Thanks for your help<br>
<br><br><div><span class="gmail_quote">2008/9/1, Jenkins, Clive <<a href="mailto:Clive.Jenkins@xerox.com">Clive.Jenkins@xerox.com</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
The instruction that caused the fault is at this address:<br> <br>> NIP [c0110ddc] init_dev+0x2bc/0x584<br> <br> <br>The hex value of the instruction is also highlighted between <> here:<br> <br>> Instruction dump:<br>
> 7d808120 4e800020 7c832378 4bfa9ea9 7c7f1b79 418201f0 a81e0062 2f800001<br> > 409efd98 83ff00d0 2c1f0000 4182fd90 <801f00b8> 70090080 408201b0 801e0060<br> <br> <br>Disassemble your kernel and look at offset 0x2BC relative to the label init_dev<br>
<br> ________________________________<br> <br> From: linuxppc-dev-bounces+clive.jenkins=<a href="http://xerox.com">xerox.com</a>@<a href="http://ozlabs.org">ozlabs.org</a> [mailto:<a href="mailto:linuxppc-dev-bounces%2Bclive.jenkins">linuxppc-dev-bounces+clive.jenkins</a>=<a href="http://xerox.com">xerox.com</a>@<a href="http://ozlabs.org">ozlabs.org</a>] On Behalf Of Sébastien Chrétien<br>
Sent: 01 September 2008 10:16<br> To: <a href="mailto:linuxppc-dev@ozlabs.org">linuxppc-dev@ozlabs.org</a><br> Subject: Trace<br> <br><br> <br> Hello,<br> <br> I am triying to write a tty_driver under ppc. And I get a kernel panic.<br>
Can somebody explain me how finding the source of the error with a kernel panic trace :<br> thanks<br> <br> Unable to handle kernel paging request for data at address 0x575555f9<br> Faulting instruction address: 0xc0110ddc<br>
Oops: Kernel access of bad area, sig: 11 [#1]<br> Modules linked in:<br> NIP: c0110ddc LR: c011118c CTR: 00000000<br> REGS: cf01bcb0 TRAP: 0300 Not tainted (2.6.26)<br> MSR: 00009032 <EE,ME,IR,DR> CR: 44002022 XER: 20000000<br>
DAR: 575555f9, DSISR: 40000000<br> TASK = cf01c000[1] 'swapper' THREAD: cf01a000<br> GPR00: 0000000c cf01bd60 cf01c000 cf04c300 ffffffff cf01bdbc 00000000 c01d0000<br> GPR08: 00001249 fffffffc 00000000 cf000420 84002022 00000000 10000b00 007fff00<br>
GPR16: 0fffa1d0 00000000 00000004 cf01bdbc 007ffec0 00000000 00000000 00800000<br> GPR24: 00000000 c01b7650 00000002 c01d0000 ffffffff ce4a6700 cf04c300 57555541<br> NIP [c0110ddc] init_dev+0x2bc/0x584<br> LR [c011118c] tty_open+0xe8/0x3e0<br>
Call Trace:<br> [cf01bd60] [cf01bd78] 0xcf01bd78 (unreliable)<br> [cf01bdb0] [c011118c] tty_open+0xe8/0x3e0<br> [cf01bde0] [c00742c8] chrdev_open+0x114/0x1b0<br> [cf01be10] [c006fb5c] __dentry_open+0x190/0x2e8<br> [cf01be40] [c006fdac] nameidata_to_filp+0x38/0x70<br>
[cf01be60] [c007bc60] do_filp_open+0x200/0x7d0<br> [cf01bf10] [c00700b4] do_sys_open+0x74/0x114<br> [cf01bf40] [c0003c94] init_post+0x34/0x258<br> [cf01bf60] [c019ca64] kernel_init+0x258/0x270<br> [cf01bff0] [c0011b3c] kernel_thread+0x44/0x60<br>
Instruction dump:<br> 7d808120 4e800020 7c832378 4bfa9ea9 7c7f1b79 418201f0 a81e0062 2f800001<br> 409efd98 83ff00d0 2c1f0000 4182fd90 <801f00b8> 70090080 408201b0 801e0060<br> ---[ end trace b7795a387aeb7786 ]---<br>
Kernel panic - not syncing: Attempted to kill init!<br> allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.<br> <br> </blockquote></div><br>