Hi all:
I am trying to bring up customized board based on MPC8270, the
kernel version is 2.4.30, it works fine on one of the Eval board
(PQ2FADS-VR, which use MPC8275).
The kernel hangs after uncompressing is done, further debug shows
that it hangs right after "rfi " instruction of the turn_on_mmu:
function in head.S
turn_on_mmu:
240 mfmsr r0
241 ori r0,r0,MSR_DR|MSR_IR
242 mtspr SRR1,r0
243 lis r0,[EMAIL PROTECTED]
244 ori r0,r0,[EMAIL PROTECTED]
245 mtspr SRR0,r0
246 SYNC
247 RFI /* enables MMU */
After i step over the RFI instruction, the PC points to C000XXX , but
all memory content is 0 by then.
my BATU0 is 0xC000FFE0 BATL0 is 0x00000002, I have 128MB RAM. The
u-boot works fine, without MMU turned on. We do have some hardware
problem, such that i have to lower the bus frequency to make the SDRAM
stable. What physical parameter could cause the board not working with
MMU on?
Any suggestion?
Thanks
lei
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