On Tue, Oct 27, 2009 at 6:06 AM, Darmawan Salihun < [email protected]> wrote:
> What is the BIOS RAM in AMD SB7XX used for? > Looks like scratchpad memory to me. From the public doc<http://developer.amd.com/assets/43366_sb7xx_bdg_pub_1.00.pdf> : 3.3 BIOS RAM The SB700 has 256 bytes of BIOS RAM. Data in this RAM is preserved until RSMRST# or S5 is asserted, or until power is lost. This RAM is accessed using index and data registers at CD4h/CD5h. Might it be enough to act as a very, very small cache-as-RAM substitute until CAR can be set up? On Tue, Oct 27, 2009 at 6:06 AM, Darmawan Salihun < [email protected]> wrote: > Is it to buffer the BIOS contents from SPI flash chip prior to > execution of the very first instruction? > I recall that it's impossible to execute code directly in an SPI chip. > That's correct, afaik. -- David Hendricks (dhendrix) Systems Software Engineer, Google Inc.
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