[U-Boot-Users] max gunzip output buffer size in do_bootm()

[Matthias Fuchs <matthias.fuchs@esd-electronics.com>]

Hi,

I ran into trouble when booting huge compressed images via bootm.
do_bootm uses a fixed maximum size for the uncompressed data of 0x400000 
bytes. That's not enough for our images (about uncompressed 9MB VxWorks 
image).

Is there any reason for the 4MB limiting? I'd like to post a patch that 
fixes this issue:

a) just increase the unc_len variable to e.g. 16MB
b) add a define with default to board config file 
(CONFIG_MAX_BOOTM_UNC_LEN). When not defined in config file, 0x400000 is 
used
c) set unc_len to mem size :-) So user must know what he is doing.

What do you like best?

BTW: When the uncompressed data is more than the unc_len limit no error 
is reported. The uncompressed data is just truncated leading to 
corrupted uncompressed data. Should that be fixed, too?

Regards
Matthias