[coreboot] KMT890 VT8237S status update

[Rudolf Marek]

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Hi all,

Today I managed to boot kernel and userspace on the Asus M2V-MX SE
(K8M890 VT8237S AMD am2 socket + SPI flash in socket)

What works:

1) IDE
2) serial line
3) USB
4) APCI poweroff with halt command + some basic ACPI powerbutton event
5) APICs are routing irqs

I will test more stuff later.

Known issues:
1) slow boot, perhaps SPI timming is too low
2) cpu freq change does not work
3) sata seems not to work
4) PCI IRQ routing does not work for external cards
5) v-link set to 8 bit (default)

Attached patch is mine WIP state of the tree.

Rudolf
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