Hi ML,
I'm evaluating the qemu-mips to simulate a mips 4kec/24kec board. I'm working on the high level booting sequence (linux init scripts), and qemu+uboot should be a good choice to emulate a basic system (flash + dram + 4kec cpu).
Furthermore, also following the doc/README.qemu_mips, I'm not able to see the u-boot prompt on my qemu because the flash is not recognized. I haven't experience with qemu-mips and I don't understand where the flash is placed (canonical 0xbfxxxx address?) and how it is managed. Reading the configs/qemu_mips.h, It seems that the flash is managed as a common CFI flash placed to 0xbfc00000 address... but u-boot shows always "Unknown FLASH on Bank 1" on startup.
Has anyone tried to use qemu-mips to boot a standard u-boot image (qemu_mips target on u-boot)?
Thanks for any suggestion.
luigi
########### Useful Infos ############
This is the qemu banner (on Ubuntu 8.10):
EMU PC emulator version 0.9.1, Copyright (c) 2003-2008 Fabrice Bellard
This is the execution log:
$ cp ../u-boot-vanilla/u-boot.bin mips_bios.bin $ dd of=flash bs=1k count=4k if=/dev/zero 4096+0 records in 4096+0 records out 4194304 bytes (4,2 MB) copied, 0,046865 s, 89,5 MB/s $ dd of=flash bs=1k conv=notrunc if=../u-boot-vanilla/u-boot.bin 163+1 records in 163+1 records out 167076 bytes (167 kB) copied, 0,00124954 s, 134 MB/s $ qemu-system-mips -M mips -pflash flash -monitor null -nographic qemu: Warning, could not load MIPS bios '/usr/share/qemu/mips_bios.bin' Terminated
$ qemu-system-mips -L . -M mips -pflash flash -monitor null -nographic
U-Boot 2009.01-00080-g8f86a36 (gen 26 2009 - 09:23:04)
Board: Qemu -M mips CPU: 24Kf proc_id=0x19300 DRAM: 128 MB ## Unknown FLASH on Bank 1 - Size = 0x00000000 = 0 MB Terminated $