[coreboot] How to test RAM beyond 640 kByte boundary

llandre r&d2 at dave-tech.it
Wed May 21 11:57:02 CEST 2008

I have a question about the ram_check function.
All the board specific codes invoke it like this:

ram_check(0x00000000, 640 * 1024);

I had a look with JTAG debugger and indeed the RAM beyond 640 KByte 
boundary is not accessible. Why? Is it possible to enable and test all 
the RAM available?


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