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Date: Thu, 27 Sep 2007 02:53:09 -0700
From: Vlad Lungu <vlad@comsys.ro>
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Subject: Re: [Qemu-devel] Qemu and Linux 2.4
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To: Alexander Voropay <alec@nwpi.ru>, qemu-devel@nongnu.org

Alexander Voropay wrote:
> <vlad@comsys.ro> wrote:
> 
>>>> - QEMU malta emulation is not really complete, to put it mildly
>>> Out of curiosity, what parts did you miss?
>> Like, for example, the PCI stuff. So I can use the network card.
> 
> PCI stuff in the QEMU/Malta works fine, but pseudo-bootrom
> does not perform PCI enumeration and leaves uninitialized PCI BARs.
> 
> Linux MIPS/Malta 2.4 can not perform PCI enumeration too.  The LANCE
> Ethernet driver *requres* a pre-initialized BARs. The situation even worse,
> since current Linux 2.4 can't be even built with NEW_PCI and PCI_AUTO
> options at all (due to linkage error).
> 
> http://www.linux-mips.org/wiki/PCI_Subsystem
> 
> There is the same PCI problem with NetBSD/evbmips and seems VxWorks/Malta.

Well, that's a pretty big showstopper, don't you think?

[snip]
> The only thing we need is a good bootrom (BIOS) for the MIPS/Malta
> (Free-YAMON ;)
> 
> As a quick'n'disty solution you could initialize PCI BARs of the
> device number 12 (0x0b, LANCE) with GDB:
> 
> (gdb) set variable {int}0xbbe00cf8=0x80005810   <--- I/O address
> (gdb) set variable {int}0xbbe00cfc=0x00002001
> (gdb) set variable {int}0xbbe00cf8=0x80005814  <--- Mem address
> (gdb) set variable {int}0xbbe00cfc=0xfc200000
> (gdb) set variable {int}0xbbe00cf8=0x80005804  <--- Enable Mem and I/O
> (gdb) set variable {int}0xbbe00cfc=0x00000003
> (gdb) set variable {int}0xbbe00cf8=0x8000583c   <---- IRQ=10 tied to Pin A
> (gdb) set variable {int}0xbbe00cfc=0xff06010a
> (gdb) cont
> Continuing.

That's dirty alright, but not exactly quick. You kind of need gdb :-)

Vlad