On Tue, 4 Nov 2008, Joshua Juran wrote:
On Nov 4, 2008, at 12:06 PM, Brad Boyer wrote:
On Tue, Nov 04, 2008 at 07:34:41PM +0100, Riccardo wrote:
Hopefully there's a logical way to detect this upgrade, but it would be
interesting to know if the update changes the gestalt ID.
You would detect an upgraded ROM by reading the ROM, I imagine.
Good point. But I think we'd need the ROM base to be supplied by Penguin?
Or even just the ROM checksum.
In Genie, it's at /sys/mac/rom.
By the way, does anyone know how to calculate a ROM checksum, or will I
have to reverse-engineer CopyROM or somesuch?
I assumed that CopyROM etc did not validate anything, they just reported
the checksum contained in the ROM (first 4 bytes). The code must be part
of the POST though, since a bad rom checksum is a sad mac error. So you
could reverse engineer that. But IIRC there is a card ROM checksum
algorithm given in Designing Card and Drivers for the Mac II and Mac SE.
It's probably the same algorithm. I don't have access to my copy at the
moment.
Finn
Josh
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