[U-Boot-Users] [PATCH] MPC8360EMDS lowboot option

Jerry Van Baren gerald.vanbaren at comcast.net
Fri Dec 1 05:26:20 CET 2006

Dave Liu wrote:
> On Thu, 2006-11-30 at 22:45 -0500, Jerry Van Baren wrote:
>> Hi Dave Liu,
>> The following patch adds a configuration to do "low boot" (HRCW.BMS = 0) 
>> as well as "high boot" (HRCW.BMS = 1).
>> Many people, myself included :o) prefer to boot out of low memory.  It 
>> has an added benefit that, if you screw up the image of of u-boot in low 
>> memory, you can switch SW9.3 FCFG and boot using the BCSR, which "high 
>> boots" (assuming you smart enough to keep a valid u-boot image at 
>> 0xFFF00000).
> The 8360EMDS u-boot is booting at low memory in default now. You can
> change it for high memory. 
>> The patch is against the top of the denx.de repository (thanks, 
>> Wolfgang, for pulling the fsl patches).
> Thanks Wolfgang and Stefan for pulling them.

Yes, if the board is not configured as a PCI slave.  I forgot to ask, is 
that a hardware restriction or is it OK to "boot low" as a PCI slave 
(mostly curious)?

In defense of the patch, it is nice to be able to easily configure 
u-boot to boot high or low.  The Makefile configuration trick is really 
handy and is how several boards handle it.


More information about the U-Boot mailing list