[syslinux] Checking CRC (of bzImage) before loading

Gene Cumm gene.cumm at gmail.com
Wed Mar 19 13:30:10 PDT 2014

On Wed, Mar 19, 2014 at 4:16 PM, Mau Z <zmau1962 at gmail.com> wrote:
> Hi,
> I am wondering how to implement the following customer's requirement :
> The system is a stand alone embedded system with no operator (with Linux).
> There is one SSD for the system's usage (and that is where the system loads
> from).
> The requirement is to have a duplication of the Linux Image, and that
> syslinux should calculate CRC of "the first image" (say bzImage_1).
> If the CRC is correct then load the image, if the CRC is not correct, than
> syslinux should try "the other image" (say bzImage_2).
> If even that is no good do nothing.
> Any suggestions as to how to implement the requirement ?

A custom COM32 module.  Look at ifcpu.c32 for an example of an if-else
module and the crypto functions in com32/util/


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