On Fri, 21 Jul 2006 11:35:25 +0200
Claus Gindhart claus.gindhart at kontron.com wrote:
Hi all,
currently i am trying to migrate our existing PowerPC board supports from the
arch/ppc - directory into the new arch/powerpc. I am directly working within
a cloned paulus_powerpc git repository on the most recent status.
We (Kontron) want to bring our kernel sources into the appropriate for an
open source submission. We are modifying both our proprietary Bootloader, and
the Linux Kernel, to make them fit to the new conventions, e.g. the flattened
device tree.
However, i dont understand the following:
In the old structure, the kernel provided a bunch of sub directories
(simple,openfirmware,...) to create a wrapper around the Linux kernel for
brining it into the format, which is appropriate for the boot loader used.
This structure was easily adaptable for custom image formats.
Now, these dirs dont exist any more.
Well, in arch/powerpc those stuff had no sense so far.. But it may change - see
below.
What is the strategy here (i could assume one the 3 variants below ?
a) Is it now in the responsibility of the bootloader, to support one of the
image formats,
which can be generated here currently ?
This way we have started with powerpc merge and it still could be used. there
are plenty of such stuff in the list archives, being discussed, and even
followed up with patches.
But that imply u-boot firmware so not interesting for you I assume.
b) Will these subdirs (e.g. simple) come here, but just where not ported
yet ?
Currently, Mark is working on a thing similar to this case. the kernel building
zImage has to compile devicetree to binary dtb and line stuff up so that
booting, the shim has started the kernel and have devicetree passed to it.
c) Or, shall such wrapper around the kernel, and/or bringing the kernel into
a particular file format
be performed outside the kernel source, by proprietary tools
(e.g. like U-boot does it with the mkimage tool) ?
This was yet another way pondered, but I guess b) looked better.
--
Mit freundlichen Gruessen / Best regards
Claus Gindhart
SW RD
Kontron Modular Computers
phone :++49 (0)8341-803-374
mailto:claus.gindhart at kontron-modular.com
http://www.kontron.com
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--
Sincerely,
Vitaly
