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Hi!
I'm still trying to run a MIPS mmon as a BIOS
:)
I've found one strange issue : when it runs
at the
KSEG0 region (0x80008000) with -kernel option it
works fine.
When I'm trying to run it in the MIPS BIOS region
(0xbfc00000)
it can't output anything to the UART and Qemu
segfaults
on the any keypress (not my program, but whole Qemu !)
Seems, UART is unmapped w/o -kernel option or
something similar.
There was no such issue in the previous CVS (a week
ago).
The "mmon-qemu" sourcecode and binaries are
there:
From the KSEG0 (run as kernel) :
=================
[EMAIL PROTECTED] mmon-qemu-0.5]$
../qemu/bin/qemu-system-mipsel -nographic -kernel mmon.elf
(qemu) Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal error, but for better emulation accuracy either use a 2.6 host Linux kernel or type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root. mips_r4k_init: load BIOS '/home/alec/mips/qemu/share/qemu/mips_bios.bin' size 131072 qemu: Warning, could not load MIPS bios '/home/alec/mips/qemu/share/qemu/mips_bios.bin' db <addr1>
[<addr2>] dump bytes from addr1 to
addr2
dh <addr1> [<addr2>] dump half-words (16 bits) dw <addr1> [<addr2>] dump words (32 bits) sb <addr> <data>... store byte sh <addr> <data>... store half-word (16 bits) sw <addr> <data>... store word (32 bits) swl <addr> <data> store word left swr <addr> <data> store word right fb <addr1> <addr2> <data> fill bytes of memory range fh <addr1> <addr2> <data> fill half-words fw <addr1> <addr2> <data> fill words l load S-records g [<addr>] go (start execution at address) h help (show this command list) >db bfc00000 BFC00000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BFC00010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BFC00020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BFC00030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ========================== From the KSEG1 (i'm using a stub file "reset"
)
==========================
[EMAIL PROTECTED] mmon-qemu-0.5]$
../qemu/bin/qemu-system-mipsel -nographic -L . reset
(qemu) Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal error, but for better emulation accuracy either use a 2.6 host Linux kernel or type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root. mips_r4k_init: load BIOS './mips_bios.bin' size 131072 Segmentation fault (core dumped) [EMAIL PROTECTED] mmon-qemu-0.5]$ gdb -c
core.15214
GNU gdb Red Hat Linux (6.1post-1.20040607.62rh) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-redhat-linux-gnu". Core was generated by `../qemu/bin/qemu-system-mipsel -nographic -L'. Program terminated with signal 11, Segmentation fault. #0 0x00000000 in ?? () (gdb) bt #0 0x00000000 in ?? () #1 0x0804b4c7 in ?? () #2 0x00000000 in ?? () ========================== --
-=AV=-
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