[U-Boot-Users] Running U-boot in cache area.

Jerry Van Baren gerald.vanbaren at smiths-aerospace.com
Mon Jan 22 14:58:29 CET 2007

sathesh babu wrote:
> Hi,
>   I am tring to run U-boot on MIPS 24KE processor.
>     I have done MIPS 24KE cache initilization and configured it for 
> write through  mode in the start.S file.
> If I specify SDRAM start address  as uncached area ( start 
> with 0xa0000000), u-boot boots up and able to get the u-boot prompt.
> It I try SDRAM start address as cached area ( Start with 0x80000000), 
> the u-boot comes up to relocation function and hangs.
> Could you please tell me what could be the problem.
> Did i mss any thing?.
> I see the same behaviour with write back mode also.
> Should i call any cache invalidation ( doing this as part of cache 
> initilization in the start.S) or flush functions before calling 
> relocation().
> I am  enabling primary cache only and no secondary cache.
> Thanks in advance.
> Regards.
> Sathesh

This may be the FAQ.  Enabling caches typically enables bursting and 
disabling caches typically disables bursting (I'm not familiar with your 
MIPS - YMMV).  This class of RAM problems tend to show up only when 


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