Re: Using reblob to load another blob from ram

[Dan <da...@so...>]

Stefan Schmidt wrote:
> Hello.
>
> On Fri, 2006-04-28 at 16:09, Erik Mouw wrote:
>   
>>> If i load blob or blob-start-elf32 the display goes blank and thats
>>> it. For blob-start at KERNEL_RAM_BASE it goes blank, too. On all the
>>> other tests exactly nothing happens.
>>>       
>> You should be able to reblob the second stage loader (i.e.: blob-rest).
>> It should be loaded at BLOB_RAM_BASE.
>>     
>
> JFYI: This did not work here. Perhaps this feature is disabled inside
> the Motorola blob. I'm busy at the moment, but hopefully have some
> time the next weekend for debugging this.
>
> regards
> Stefan Schmidt
>   

I observed that while BLOB loads and jumps to BLOB_RAM_BASE, the second 
stage loader (blob-rest) is actually built to run at 
BLOB_ABS_BASE_ADDR.   The reblob command should be [safely] copying the 
second stage BLOB from BLOB_RAM_BASE to BLOB_ABS_BASE_ADDR and then 
jumping there, but I guess it doesn't (not that I've checked in a while).

So one trick I use for reblob is to build and install a BLOB, then swap 
those two defines, build a new BLOB, and feed the second BLOB to the 
first.  Did that make sense?

cheers,
Dan