Shinya Kuribayashi:
Thank you for your hint. I think it will be of help in the future debugging.
But my problem occurs just in the process of rtl8139 reset.
Lucas Jin wrote:
Hi, all
I am debuging RTL8139 driver for a board based on Sandpoint8245 and I have a problem.
I don't know much about Sandpoint 8245, but
The CPU panic on line 529 in rtl8139.c. (outb(CmdReset, ioaddr + ChipCmd);)
Serial port displayed: ( Bad trap at PC: fffffffc, SR: 1000, vector=800 NIP: FFFFFFFC XER: 20000000 LR: 00001288 REGS: 077ceb30 TRAP: 0800 DAR: 077CECC0 MSR: 00001000 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 00
GPR00: 00000010 077CEC20 FFFFFF1F 00000000 0000000A 00000010 FFFFFFFB 00000000 GPR08: 00000040 81000000 00000000 FFFFFFFF 00000020 A7AC5E24 07FFD000 080D1000 GPR16: 31380950 8E109020 05808002 55D84040 00003032 00000001 00000000 00000001 GPR24: 00000000 077CEEA8 077CEFC8 00000005 07FF80C8 077CEF94 07FFD6D8 00000000 Call backtrace: Exception in kernel pc fffffffc signal 0 )
The value of ioaddr is 0x80000000
The value of _IO_BASE outb uses is defined as 0
AFAICT the drivers/rtl8139.c has at least two problems:
First, the prospekctive target is MIPS because it uses KSEG1ADDR macro to obtain uncached address.
Moreover it only works under cache-{disabled,less} CPU because it lacks of flush_cache() before transmitting data or reclaiming rx buffers.
thanks,
Shinya Kuribayashi
Yours Lucas Jin