[U-Boot-Users] TEXT_BASE question

[Frank Young]

Hi,

I am trying to install u-boot on my walnut board with PPC405. In file 
board/walnut405/config.mk, TEXT_BASE is defined as FFFE0000. Does that mean 
the u-boot.bin has to start from FFFE0000?

My problem is that on my board the address space from FFF80000 to FFFFFFFF 
is reserved for a special purpose, so I can't put the u-boot.bin at 
FFFE0000. But if I change the TEXT_BASE to another one, for example 
FFF00000, then the u-boot.bin generated by the compiler is FFFFFFFF - 
FFF00000 = 1MB. It means I still can't put the u-boot.bin to FFF00000 
because it will overwrite the reserved address space anyway. I understand 
that u-boot is trying to fill the gap between TEXT_BASE and the end of the 
flash. So my question is:

1. If I use TEXT_BASE = FFFE0000 and simply put the u-boot.bin generated to 
FFF00000, will it mess up the addressing in the u-boot?

2. If the answer for 1 is yes, how can I move up the end of flash to 
FFF80000 so that the u-boot.bin will fill from FFF00000 to FFF80000 instead 
of from FFF00000 to FFFFFFFF?


Thanks,
Frank

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