Re: custom board

[Holger S. <h.s...@mn...>]

> i´m new to the bootloader staff and i want to use blob for my system. It
> is based an the Accelent IDP for PXA. What have i to do to port blob to
> a custom board?

Hi !

I also have an Accelent Board.

First you need a cross-compiler.

Then you need to read README files.

Next you will need time and practice.

A JTAG debugger like the BDI 2000 would be very helpful.


Now you see in src/blob/ that there is already a pxa_idp.c file. Jeff started 
a port, but discontinued it because lack of time. Therefore you can see such 
gems like in start-pxa.S:

        @ loop here infinitely until I can get this to compile and boot
        @ TODO: get this to compile and boot.
crap:
        b crap



The biggest piece of incomplete part is src/blob/memsetup-pxa250.S. As you can 
see, there are lots of values that get stored into PXA internal registers. 
You have to get them all rigth. Maybe you can get those values from my 
memsetup.S (part of armboot-for-Accelent PXA IDP) and store them in 
include/blob/arch/pxa_idp.h from 
http://www.mn-logistik.de/unsupported/pxa250/


Please note: when I once tried quickly to get blob running, arm-linux-objdump 
-D src/blob/blob-start revealed that some X!%MFP stuff it did use virtual 
addresses (the ones from Linux) for the PXA internal registers. This is of 
course total crap (but might be an issue of the used kernel, I tried it with 
Linux 2.4.19-rmkX-pxaY). You always need to access stuff at physical 
addresses (blob run's without the MMU enabled). Please take care of that.

Greetings, Holger

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MN-Logistik GmbH         http://www.mn-logistik.de
Holger Schurig
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