can't access memory above 496M
Alan.Rossetti at tellabs.com
Wed Oct 7 02:43:16 EST 2009
We have an embedded prouct using 8270 based on pq2fads with MontaVista 4.0.1, kernel 2.6.10. We recently had a need to increase memory. We can populate 1x256M, 2x256M, 1x512M or 2X512M. In all configurations with at least 512M, it we set memory size to 496M or greater system crashes on boot up while populating rootfs. With memory size set to <496M system boots and runs fine. U-boot can see and access/test all memory.
Manual says alignment exception can also be due to crossing segment or BAT boundary. BATs look OK, configured as 256M blocks.
Any thoughts would be appreciated.
desched thread 0 started up.
Machine check in kernel mode.
Caused by (from SRR1=49030): Transfer error ack signal
Oops: machine check, sig: 7 [#1]
NIP: C0008680 LR: C0004FAC SP: C0971C80 REGS: c0971bd0 TRAP: 0200 Not tainted
MSR: 00049030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
TASK = c0944ab0 'swapper' THREAD: c0970000
Last syscall: 120
GPR00: 00000000 C0971C80 C0944AB0 EEC00000 EEC00000 00017C0B EEBFFFFC 00000004
GPR08: 0000007C 00000000 0000005F 00000000 00944C80 FFFE7DFF C093882C FFFFFFFF
GPR16: C01D3D84 C094C9E0 0009E000 004197FF 00001000 00000000 0009E000 C0971DCC
GPR24: 00000000 FF777000 0000000B 00000000 00000000 C0220000 C0971CD0 00000000
NIP [c0008680] fix_alignment+0x1e4/0x4bc
LR [c0004fac] AlignmentException+0x18/0xb4
Kernel panic - not syncing: Attempted to kill init!
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E-Mail: arossett at tellabs.com<mailto:arossett at tellabs.com>
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