内核 head.S调试，enable MMU后 挂死求助，谢谢！

改了这部分的原始代码了吗？没改的话建议先确认一下你的DDR配置是否正确。

Hi Steven

内核的head.S没有修改过，关于DDR3的配置，感觉没多大的问题：uboot 重定位到ddr中运行启动正常，在u-boot#下用mtest命令测试也是ok的（该命令已经打开CONFIG_SYS_ALT_MEMTEST宏功能 并进行长时间的测试）

U-Boot SPL 2013.01.01 (Apr 29 2015 - 00:46:06)

===board_init_f() from arm/lib/spl.c===
>>spl:board_init_r()
OMAP SD/MMC: 0
boot mode - FAT
reading u-boot.img
reading u-boot.img

===board_init_f() from arm/lib/board.c===

U-Boot 2013.01.01 (Apr 29 2015 - 00:46:06)

Top of RAM usable for U-Boot at: 87ff0000
DRAM: 128 MiB
>>board.c :board_init_r()
WARNING: Caches not enabled
Could not get board ID.---Pls dont care!
NAND: MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
*** Warning - readenv() failed, using default environment

Net: <ethaddr> not set. Validating first E-fuse MAC
PHY reset timed out
cpsw, usb_ether
arm/lib/board.c ->>board_int_r here1
Hit any key to stop autoboot: 0
mmc0 is current device
SD/MMC found on device 0
reading uEnv.txt
** Unable to read file uEnv.txt **
reading uImage
3225808 bytes read in 510 ms (6 MiB/s)
Booting from mmc ...
## Booting kernel from Legacy Image at 80007fc0 ...
Image Name: Linux-3.2.0
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3225744 Bytes = 3.1 MiB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
XIP Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel. 

-------后续再head.S的 enable MMU后挂死