On Tue, Feb 18, 2014 at 10:09:10AM -0600, Dennis Gilmore wrote: > I'm putting what I have for the documentation so far at the end of this > email. I think that soc families should have a common settings file, > each board should have its on file and then we have a common set of > configurations on how to boot.
For the next round, please put this into doc/ as part of the first patch. Thanks! [snip] > fdt_addr_r: > Mandatory, This is the location where the sysboot/pxeboot with load the dtb > to, > using the fdtdir/devicetreedir or fdt/devicetree options in the pxe/extlinux > config file. The location can be anywhere in ram it just needs to not overlap > with anything, allowing 1 megabyte seems to be a safe option. > > ramdisk_addr_r: > Mandatory, This is the location where the sysboot/pxeboot with load the > initramfs to, using the initrd option in the pxe/extlinux config file, the > location of the initramfs does not matter, there needs to be enough room to be > able to store any image. Making the image the last item stored should allow > for > any initramfs to fit and not overwrite anything else. > > kernel_addr_r: > Mandatory, > > pxe_addr_r: > Mandatory, used by the PXE code to hold the pxelinux config file. The location > can be anywhere in ram it just needs to not overlap with anything, allowing 1 > megabyte seems to be a safe option. > > scriptaddr: > Mandatory, > > suggested mapping: > 16M We need to talk much more about the suggested mapping as there's a few hard requirements that must be obeyed. The device tree _must_ be placed within kernel accessible low mem and not overwritten by zImage decompression. A reference to Documentation/arm/Booting in the kernel would also be helpful and then summarize saying kernel_addr_r should be above 32MiB and below 128MiB from the base of system ram. -- Tom
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