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Re: [PATCH v2 00/10] dp8393x: fixes for MacOS toolbox ROM

From: Philippe Mathieu-Daudé
Subject: Re: [PATCH v2 00/10] dp8393x: fixes for MacOS toolbox ROM
Date: Fri, 2 Jul 2021 15:03:56 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

Hi Mark,

On 6/25/21 8:53 AM, Mark Cave-Ayland wrote:
> Here is the next set of patches from my attempts to boot MacOS under QEMU's
> Q800 machine related to the Sonic network adapter.
> Patches 1 and 2 sort out checkpatch and convert from DPRINTF macros to
> trace-events.
> The discussion for the v1 patchset concluded that the dp8393x device does
> NOT have its own NVRAM (there is no mention of it on the datasheet) and so
> patches 3 to 5 move the generation of the PROM to the q800 and jazz boards
> separately to allow the formats to diverge.
> Patch 6 adds an implementation of bitrev8 to bitops.h in preparation for
> changing the q800 PROM storage format, whilst patch 7 updates the MAC address
> storage and checksum for the q800 machine to match the format expected by the
> MacOS toolbox ROM.
> Patch 8 ensures that the CPU loads/stores are correctly converted to 16-bit
> accesses for the network card and patch 9 fixes a bug when selecting the
> index specified for CAM entries.
> Finally since the MIPS magnum machine exists for both big-endian (mips64) and
> little-endian (mips64el) configurations, patch 10 sets the dp8393x big_endian
> property accordingly using a similar technique already used for the MIPS malta
> machines.
> Migration notes: the changes to the dp8393x PROM are a migration break, but we
> don't care about this for now since a) the q800 machine will have more
> breaking migration changes as further MacOS toolbox ROM support is upstreamed
> and b) the magnum machine migration is currently broken (and has been for
> quite some time).
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> v2:
> - Move PROM generation from dp8393x to q800 and magnum machines and remove
>   the existing code from the device itself
> - Add bitrev8 implementation to bitops.h so it can be used elsewhere in
>   future. Use a shift/merge technique rather than a massive table lookup
>   as we don't care about speed
> - Add patch to set the big_endian property correctly depending upon whether
>   a big-endian or little-endian configuration is being used
> Mark Cave-Ayland (10):
>   dp8393x: checkpatch fixes
>   dp8393x: convert to trace-events
>   hw/mips/jazz: move PROM and checksum calculation from dp8393x device
>     to board
>   hw/m68k/q800: move PROM and checksum calculation from dp8393x device
>     to board
>   dp8393x: remove onboard PROM containing MAC address and checksum
>   qemu/bitops.h: add bitrev8 implementation
>   hw/m68k/q800: fix PROM checksum and MAC address storage
>   dp8393x: don't force 32-bit register access
>   dp8393x: fix CAM descriptor entry index
>   hw/mips/jazz: specify correct endian for dp8393x device

Since a MIPS machine is involved, I'm queuing patches 1-7,10
(PROM cksum) to mips-next. I'm leaving 8-9 for further discussion
after seeing the guest memory traces.



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