On Wed, 2003-05-14 at 15:26, Jeff Baitis wrote: > Hi all: > > I implemented memory tests in my bootloader code for the AU1500. I'm trying > to figure out why Linux boots when loaded into cached KSEG0 (0x 80c0 0000), > but my memory test FAILS for this same region. > > (pretty backwards huh? get linux booting, then write memory tests!) > > > I start by writing 0x5555 5555 to all of uncached memory, reading it back, and > I write 0xAAAA AAAA to all of uncached memory and read it back. > > This works great. > > Next, I try to write 0x5555 5555 to cached KSEG0 memory, and it fails at addr > 0x8000FE50. But Linux boots! You're not overwriting any of the boot exception vectors, right? What's the failure exactly and how does the test work? Pete > I'm not issuing SYNC commands when writing to cached memory; could this be > the problem? > > We've exhaustively verified the memory burst parameters, etc. They look good. > > Thank you in advance for your ideas! > > Regards, > Jeff
