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Date: Wed, 5 Nov 2008 20:25:41 +0200
From: "Blue Swirl" <blauwirbel@gmail.com>
Subject: Re: [Qemu-devel] [PATCH] [RESEND] SM501 emulation for R2D-SH4
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To: qemu-devel@nongnu.org, andrzej zaborowski <balrogg@gmail.com>

On 11/5/08, Shin-ichiro KAWASAKI <kawasaki@juno.dti.ne.jp> wrote:
> Blue Swirl wrote:
>
> > On 11/4/08, Shin-ichiro KAWASAKI <kawasaki@juno.dti.ne.jp> wrote:
> >
> > > Thank you for reviewing!
> > >
> > >  I add the new version of patch to this mail, which reflects
> > >  you and andrzej's comments.  Some more comments on it will be
> > >  appreciated.  Especially advice on VRAM implementation with
> > >  normal RAM will be useful for me.
> > >
> > > > The display buffer should be allocated using machine definition
> > > >
> > > .ram_require.
> > >  I tried normal RAM implementation : "#define USE_NORMAL_RAM" in the
> patch
> > > will
> > >  turn the new implementation on.  But it causes system hang during
> SH-Linux
> > > boot up.
> > >  The initial VRAM clearance seems to cause the hang.
> > >  The reason might be my wrong implementation, or any MMU problem of SH4.
> > >
> > >  I did,
> > >  - added VRAM size to .ram_require
> > >  - invoked qemu_ram_alloc() with the VRAM size parameter,
> > >  - and invoked cpu_register_physical_memory(), passing
> the
> > > return value of
> > >  qemu_ram_alloc() as third parameter.
> > >
> > >  Is this sequence correct?
> > >
> >
> > Yes, but the system RAM is not allocated using qemu_ram_alloc. Now
> > qemu_ram_alloc gives the same area (0 to VRAM_SIZE) the second time.
> >
> > So the following:
> >    /* Allocate memory space */
> >    cpu_register_physical_memory(SDRAM_BASE, SDRAM_SIZE,
> 0);
> > should be changed to:
> >    ram_addr = qemu_ram_alloc(SDRAM_SIZE);
> >    cpu_register_physical_memory(SDRAM_BASE, SDRAM_SIZE,
> ram_addr);
> >
> > Maybe that helps?
> >
>
>  Yes, it helps.  Thank you!
>
>  Here's the new patch which uses normal RAM as the VRAM, and
>  checks VGA_DIRTY_FLAG for partial update.
>
>  I think it is ready for merge to the trunk.
>  Could anyone help it?

Looks good to me. What about you, Andrzej?