Re:linuxppc-embedded help needed:kernel access of bad area

Re:linuxppc-embedded help needed:kernel access of bad area

[zengshuai]

detail:
---------------------------------------------------------------------------------
# ls
led-app.exe   led-module.o
# ./led-app.exe
open led-app.exe...OK!
 Oops: kernel access of bad area, sig: 11
NIP: C30B11B4 XER: 00000000 LR: C003A310 SP: C06B1F00 REGS: c06b1e50 TRAP: 0300
   Not tainted
MSR: 00009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
DAR: 04500000, DSISR: 20000000
TASK = c06b0000[201] 'led-app.exe' Last syscall: 3
last math c06b0000 last altivec 00000000
GPR00: C003A310 C06B1F00 C06B0000 C01A5AA0 7FFFFDE0 00000014 C01A5AC0 00000000
GPR08: 00000000 04500000 0000000C C01A0000 30025CE8 10018B5C 00000000 00000000
GPR16: 00000000 00000000 00000000 00000000 00009032 006B1F40 00000000 C0003E88
GPR24: C0003BE0 00000001 10000500 7FFFFEA4 7FFFFDE0 FFFFFFEA C01A5AA0 00000014
Call backtrace:
10000A1C C003A310 C0003C3C 100004AC 0FEC6D74 00000000
Segmentation fault
#
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> -------------------
> From: zengshuai@sogou.com 
> To: ppc 
> Subject: linuxppc-embedded help needed:kernel access of bad area
> Sent: Wed Nov 30 16:18:06 CST 2005
> 
> > i writed a led driver for PQ2FADS(a ppc board).
> > but i can't read/write 0x04500000 where led register addr locate in.
> > i tested two ways to do that.
> > first,
> > p=0x04500000;
> > *p=0x12;
> > ....
> > second,
> > outb(0x12,0x04500000);
> > ...
> > two ways both didn't work.they had a some wrong:kernel access of bad area.
> > how can i know which area is bad area or good area?
> > and what can i do next? thanks.
> > 
> > ------------------------------
> > 我现在使用Sogou.com的2G邮箱了，你也来试试吧! 
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> > 
> > _______________________________________________
> > Linuxppc-embedded mailing list
> > Linuxppc-embedded@ozlabs.org
> > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> 
> 
> ------------------------------
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RE: RE: linuxppc-embedded help needed:kernel access of bad area

[Rune Torgersen]

> -----Original Message-----
> From: zengshuai@sogou.com
> Sent: Thursday, December 01, 2005 00:52
> #define BCSRADDR 0x04500000

This address is wrong.
It's the address the manual gives, but the bootloadre usually moves it
because it interferes with the SDRAM when running Linux.
Check the bootloader, or even better, if you know which ChipSelect the
BCSR is on, read the BRn register and use that address.

sort of like:
bcsr_addr =3D cpm2_immr->im_memctl.memc_br1 & 0xffff8000; // BCSR is on
CS1 on MPC8266ADS board