Can I use libpayload to make a payload for a 64 bit ROM? I'm following the coreboot minnowboard max 64bit instructions below and substituting the default payload for the payloadlib sample hello world payload.

Also, is there a lower level method than using payloadlib to make a simple coreboot payload elf that just initializes rs232 and prints a string over rs232?

Any good low level documentation you would recommend for understanding how a payload needs to initialize rs232 and prints a string?

Hi Adam

On Sat, Mar 7, 2015 at 5:46 AM Adam Duncan <adam.duncan@gmail.com> wrote:

Hi all. I am new to coreboot and just built a default coreboot+seabios ROM and ran it on a 64bit minnowboard max. Now I'd like to build a simple hello world payload elf that would simply print a string on rs232.

Can you recommend the best approach to do this? I was looking at using libpayload but read in the README that it creates 32 bit elfs.

Libpayload is exactly what you want to use to make a simple hello world. The processor is in 32bit mode and can run 32bit code, if that is your concern.

Regards,

Marc

Thanks!
Adam
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