Loading Linux from already running code..

Philipp Ittershagen p.ittershagen at googlemail.com
Tue Sep 27 04:13:24 EST 2011

On Mon, Sep 26, 2011 at 7:26 PM, Carlos Munoz <cmunoz at sablenetworks.com> wrote:
> You could build a tarball containing the root files system, dtb, Linux,
> plus a header indicating where the different pieces need to be loaded.
> Then your initial code loads the different parts at the right memory
> locations, sets up the Linux arguments, and jumps to Linux.

That is exactly what the firmware-independent simpleImage.initrd.*
targets already do. The resulting elf file include the dtb and initrd
as well as a prompt-like boot arg cli.
I think it will be possible to just place the simpleImage.initrd.*
into you memory and let the existing code jump to the start adress of
the elf image. I managed to start a ppc core using JTAG and the
simpleImage.initrd elf files and I think the procedure is very much
the same but instead of the JTAG debugger setting the PC to the start
address, your startup code has to do it.


More information about the Linuxppc-dev mailing list