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Re: [Qemu-devel] [PATCH] SH4: SCI improvement

From: Jean-Christophe PLAGNIOL-VILLARD
Subject: Re: [Qemu-devel] [PATCH] SH4: SCI improvement
Date: Sat, 6 Dec 2008 10:44:01 +0100
User-agent: Mutt/1.5.18 (2008-05-17)

On 13:39 Mon 24 Nov     , Shin-ichiro KAWASAKI wrote:
> Hi, Jean-san!
> It seems a good idea to make u-boot run on SH4-QEMU,
> for brushing up SH4 emulation.
> Jean-Christophe PLAGNIOL-VILLARD wrote:
>>      I've add the flash support at 0xA0000000
>>      and have qemu refusing to boot from it
>>      qemu: fatal: Trying to execute code outside RAM or ROM at 0xa000000A
>>      I've also try to boot u-boot as a kernel and have the output working
>>      but not the input. Impossible to type anything
> I'm afraid that I have no idea about these two points now.
> I just guess MMU emulation and SCIF emulation might not be enough to run 
> u-boot.
> To investigate them more closely, I downloaded current u-boot git repository,
> build if for r2d, and run u-boot.bin with -kernel option.  But u-boot couldn't
> boot with assertion failures.  Following two parts caused them.
> - MMUCR initialization with 16 bit word write causes failure.
>   QEMU only implements 32 bit write for it, following SH7750 document.
> - BSC's PCR access cause failure.   QEMU does not implement it yet.
> Have you handled them?
you need to apply 1 patch on u-boot

r2dplus fix register access
I've send to the U-Boot ML

and 2 patchs to qemu

>From you
sh4: pci and mmu support
and from I
SH7750/51: add register BCR3, NCR4, PCR, RTCOR, RTCNT, RTCSR, SDMR2, SDMR3 and
fix BCR2 support

Best Regards,

Attachment: 0001-r2dplus-fix-register-access.patch
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