Messages in this thread | | | Date | Thu, 12 Apr 2007 14:05:50 +0800 | From | gshan <> | Subject | help me on 2.6.15 kernel on MPC850 |
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Hey Guys,
The CPU was spinning when executing in head_8xx.S::initial_mmu. I have located the instruction that cause the spinning through on-board leds. Do you have any ideas?
#ifdef CONFIG_8xx_COPYBACK mtspr SPRN_DC_CST, r8 <<< The spinning was caused by this instruction #endif
#else /* * For a debug option, I left this here to easily enable * the write through cache mode */ lis r8, DC_SFWT@h mtspr SPRN_DC_CST, r8 lis r8, IDC_ENABLE@h mtspr SPRN_DC_CST, r8 #endif
blr
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The output from u-boot:
=> tftp 0x100000 uImage Using SCC ETHERNET device TFTP from server 90.0.0.3; our IP address is 90.0.0.50 Filename 'uImage'. Load address: 0x100000 Loading: ################################################################# ################################################################# ################################### done Bytes transferred = 844738 (ce3c2 hex) => bootm ## Booting image at 00100000 ... Image Name: Linux-2.6.15 Created: 2007-04-07 17:25:29 UTC Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 844674 Bytes = 824.9 kB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Uncompressing Kernel Image ... OK <<< The CPU is spinning then
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The hardware, bootloader, linux I'm using:
1) MPC850, 1KB DCache + 2KB ICache 2) u-boot 1.1.4 ( Data Cache is turned off all the way, but instruction cache is always on) 3) ppclinux 2.6.15
Thanks, Gavin
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