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
-----------------------------
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
-----------------------------
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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