[U-Boot-Users] [PATCH] 83xx: Put the version (and magic) after the HRCW.

Jerry Van Baren gerald.vanbaren at smiths-aerospace.com
Fri Dec 8 22:36:01 CET 2006

Timur Tabi wrote:
> Jerry Van Baren wrote:
>> * version-in-text - Put the version (and magic) after the HRCW.
> This patch works on the 8349E-mITX.  Ack.
> However, there's a caveat.  The 8349E-mITX doesn't place the U-Boot 
> image over the HRCW - it's located somewhere else in flash.  So the HRCW 
> in the U-Boot image is ignored.  This may also be true of some other 
> 83xx boards.

Hi Timur,

I suspect your 8349E-mITX is configured to "boothigh" (BMS = 1, also 
known as HRCWH_FROM_0XFFF00100) so the u-boot image starts at 0xFFF00000 
rather than at the start of flash (nominally 0xFE000000).  In this case 
you should find the magic and version string starting at 0xFFF00040.  Of 
course, in the .bin/.srec/whatever file, it should be at offset 0x40.

That is one of the advantages of "bootlow" - the HRCW from u-boot is 
placed at the start of flash and thus is used.  With "boothigh" , the 
HRCW that is part of u-boot is in the "wrong place" and thus is not 
used.  (Another advantage of "bootlow" is that you don't have to 
dedicate 1MB of flash for the u-boot image.)

Looking at include/configs/MPC8349ITX.h, if PCI_64BIT is defined it does 
a lowboot, otherwise it does a highboot (which seems odd to me, but 
people tell me I'm odd and the world is normal).

>> * lowboot - Add high/lowboot configuration to the Makefile, etc.
> I haven't tried this patch.

The "lowboot" patch is specific to the MPC8360EMDS, although it could be 
copy and pasted into the MPC8349ITX configuration easily enough.


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