Alexander Voropay wrote:
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 !)
I've found this bug : hw/mips_r4k.c:mips_r4k_init()
Qemu/MIPS does not initialize an ISA memory region when issued
without -kernel option. (I've added some debug output).
Whith -kernel:
cpu_register_physical_memory: start=00000000, size=08000000, offset=00000000
cpu_register_physical_memory: start=14000000, size=00010000, offset=00000050
cpu_register_physical_memory: start=100A0000, size=00020000, offset=00000060
cpu_register_physical_memory: start=E0000000, size=00400000, offset=08000000
Without -kernel:
cpu_register_physical_memory: start=00000000, size=08000000, offset=00000000
cpu_register_physical_memory: start=1FC00000, size=00020000, offset=08400010
Segmentation fault
Could someone correct this ? The ISA region and devices initialization should
be performed *before* any fileload.
P.S. The MIPS initial state (PC=0xbfc00000) is defined twice in the qemu:
./target-mips/translate.c:cpu_mips_init():1766
and
./hw/mips_r4k.c:mips_r4k_init()
Seems, this is a bug too.
--
-=AV=-
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