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authorDave Liu <daveliu@freescale.com>2008-12-16 12:09:27 +0800
committerAndrew Fleming-AFLEMING <afleming@freescale.com>2008-12-19 18:32:48 -0600
commitf51f07eb58fad12de9294ba4ee6c09a0ddeaee03 (patch)
tree72add91fbdc012d5a449748ca2cd2e698fa10e63 /net
parent58da8890d5fbd074746037722a423de9ac408616 (diff)
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85xx: Fix the boot window issue
If one custom board is using the 8MB flash, it is set as FLASH_BASE = 0xef000000, TEXT_BASE = 0xef780000. The current start.S code will be broken at switch_as. It is because the TLB1[15] is set as 16MB page size, EPN = TEXT_BASE & 0xff000000, RPN = 0xff000000. For the 8MB flash case, the EPN = 0xefxxxxxx, RPN = 0xffxxxxxx. Assume the virt address of switch_as is 0xef7ff18c, the real address of the instruction at switch_as should be 0xff7ff18c. the 0xff7ff18c is out of the range of the default 8MB boot LAW window 0xff800000 - 0xffffffff. So when we switch to AS1 address space at switch_as, the core can't fetch the instruction at switch_as any more. It will cause broken issue. Signed-off-by: Dave Liu <daveliu@freescale.com>
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