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Re: QEMU and mips linux

To: Danny Home Educator <dannyhsdad@gmail.com>
Subject: Re: QEMU and mips linux
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 11 Aug 2005 18:41:28 +0100
Cc: linux-mips@linux-mips.org
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On Thu, Aug 11, 2005 at 12:19:08PM -0500, Danny Home Educator wrote:

> I've gotten the binutils and gcc per chain tools directions (except for 
> mips-unknown-linux-gnu i.e., 32 bit version of the compiler, etc.) and built 
> my own mips cross compiler (I'm on Linux/x86). Then I got the kernel source 
> from CVS and in the make menuconfig, all I did was change the machine 
> selection to be QEMU and CPU selection to be R4x00.
> 
> Then I hand edited the .config to enable CONFIG_CROSSCOMPILE and then I 
> built the kernel:
> 
> make CROSS_COMPILE=mips-unknown-linux-gnu-
> 
> And then I got compile failure with:
> 
> LD init/built-in.o
> LD .tmp_vmlinux1
> arch/mips/kernel/built-in.o: In function `show_cpuinfo':
> proc.c:(.text+0x9c88): undefined reference to `get_system_type'
> proc.c:(.text+0x9c88): relocation truncated to fit: R_MIPS_26 against 
> `get_system_type'
> make: *** [.tmp_vmlinux1] Error 1
> 
> 
> I then edited arch/mips/qemu/q-setup.c to add:
> 
> 9,14d8
> < const char *get_system_type(void)
> < {
> < return "QEMU MIPS";
> < }
> <
> <

My bad.  I've so far compiled it with procfs disabled.  Will fix.

> And I was able to build vmlinux. I've gotten qemu-0.7.1, created blank 
> bios.bin file and when I try to run it, I get:
> 
> % qemu-system-mips -kernel vmlinux -m 16 -nographic
> (qemu) mips_r4k_init: start
> mips_r4k_init: load BIOS '/usr/local/share/qemu/mips_bios.bin' size 131072
> 
> And hangs there.
> 
> Has anyone else tried qemu with the latest mips linux? Thanks.

You need to enable serial console and add -append console=ttyS0 to the
Qemu options.  That all won't help you too much because the emulator will
hang on the first instruction in user mode.

  Ralf

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