[LinuxBIOS] [PATCH] LAR checksums

[Alex Beregszaszi]

Hi,

checksum-fix.diff fixes a checksum calculation bug in the lar utility,
where it would checksum less bytes then desired.

lar-check-sum.diff implements checksum checking in the runtime lar code.

I implemented the check inside the filename check, thus it wont be
executed on unneeded entries. As my assumption was that I cant modify
the memory, the code is skipping bytes between 20-24 of the header
(checksum field) to generate a correct sum.

This is bad, as the numbers shall be updated at every lar structure
change. This is good, as we are not writing to memory.