[U-Boot-Users] 8xx boot - low or high

Robin Gilks robin.gilks at tait.co.nz
Mon Aug 25 05:17:44 CEST 2003


Subject is a mpc86x based project.

Up until now I've been using an eval board which boots low (from 0x100) 
but to save parts on the target hardware I'd like to boot high from 
0xfff00100 so I don't have to set IIP (default vectors) or ISB (default 
IMMR) in the hardware configuration word.

Can someone suggest an already implemented port of u-boot that starts 
from the high vector so I can get an idea of how to structure the linker 
control file so that start.o is *NOT* at the beginning but someplace up 
the image.


Can I start execution with IMMR at 0x000000000 (by not setting ISB in 
the config word) and still run code from 0x100 (so I only have to pull 
up IIP at reset).

Robin Gilks
Senior Design Engineer          Phone: (+64)(3) 357 1569
Tait Electronics                Fax  :  (+64)(3) 359 4632
PO Box 1645 Christchurch        Email : robin.gilks at tait.co.nz
New Zealand

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