On Fri, Dec 19, 2008 at 11:57 AM, Pattrick Hueper <[email protected]>wrote:
> Hi, > > well following the BIOS spec (i think its somewhere in the PNP BIOS > spec... i have to check... ) the BIOS copies the ROM to RAM... since > YABEL uses its own "virtual" memory it _has_ to copy the ROM to its > RAM... Yes. Right now there's just a redundant copy, since Coreboot copies it to RAM too. > also some of the cards i have used do actually modify the > memory where the ROM is stored, so it has to be in the virtual RAM. > > Currently, the ROM is always copied from the Expansion ROM bar of PCI > devices.... i havent had to initialize any onboard devices. If there > is a parameter to run_bios that points to the location of the Option > ROM i could pass that parameter to YABEL and only use the Expansion > ROM BAR if that parameter is not set (null?). That's what I was thinking. > But IIRC i still have to > copy it to the virtual memory. Yes. > If it helps coreboot to know where the Option ROM image is after > execution of the ROM, i guess YABEL could return the location of the > ROM (the length which could be changed during execution is part of the > ROM, so coreboot could figure out how much to copy back if it decides > to do so. I don't think Coreboot cares after the card is initialized. > I am thinking of buying a x86 board to do coreboot development, i am > wondering which one would be a good choice with regards to YABEL and > maybe SEABIOS development? Any recommendations? > My requirements: > > coreboot-v3 and preferably v2 "compatible" > PCI and PCIe slots > since Myles mentioned onboard devices with ROM in LAR that would be > very interesting too... You can test even with an add-in card if you "pretend" its onboard. Then you can have coreboot give you a pointer to it and initialize it. > "affordable" > > I am really unsure what else to look for... Flash Chip Types? Processor? Socketed flash chip. Preferably compatible with a BIOS savior. Thanks, Myles
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