On 09/04/2012 01:34 PM, Robie Basak wrote:
On Tue, Sep 04, 2012 at 01:10:31PM -0500, Rob Herring wrote:
On 09/03/2012 04:44 AM, Robie Basak wrote:
I got to "highbank" because we need to distinguish the kernels and "highbank", "armadaxp" etc. are the existing Ubuntu kernel flavour names.
That's a very short sighted view.
No, it's not a view at all. I just explained how I reached this suggestion. Also, note that I am NOT assuming a one-to-one mapping between kernel flavours and <subarch> (whatever subarch might mean). I explicitly define is as a separate namespace which will need to have a known mapping in Ubuntu to determine the kernel to use.
In 3.7, we will likely multi-platformkernels starting with Versatile Express, Highbank and mvebu (Armada XP). Perhaps OMAP will happen too. Assuming you wanted to support all these platforms from a single kernel build, how would you manage it?
With multiple default.arm-<whatever> names mapping to single Ubuntu kernel flavours as necessary. What am I missing?
Just making sure you are fine with that.
Perhaps you always keep separate platforms and just symlink things back to a common kernel? You could also argue that the command line options will always be different, so we'll always need to have per platform directories.
Sure - we could do that. I don't think it'll matter too much how we do it provided that we can.
We could make the directory list be an environment variable to iterate thru then it's not fixed in the bootloader. We'd still need to come up with defaults though.
This sounds good to me.
One additional point that's just come up - we'd also like to know the MAC address, which at the point of serving a default.<something> file we won't statelessly know if the TFTP server is not in the same ethernet segment. How about also hitting something like pxelinux.cfg/01-<mac>.arm-<somthing> before pxelinux.cfg/01-<mac> first, and then the default fallback behaviour later? This would make my life a bit easier by not having to save state in between calls to know the MAC address at the time of serving the default file.
That's really a departure from standard PXELINUX and people have complained already that u-boot PXE is not standard PXELINUX. :) How is this specific to ARM?
Rob