2015-02-26 11:17 GMT+01:00 Paul Burton <paul.burton@xxxxxxxxxx>: > On Thu, Feb 19, 2015 at 01:50:23PM +0000, Matthew Fortune wrote: >> Hi Daniel, >> >> The spec for MIPS Unified Hosting Interface is available here: >> >> http://prplfoundation.org/wiki/MIPS_documentation >> >> As we have previously discussed, this is an ideal place to >> define the handover of device tree data from bootloader to >> kernel. Using a0 == -2 and defining which register(s) you >> need for the actual data will fit nicely. I'll happily >> include whatever is decided into the next version of the spec. this originates from an off-list discussion some months ago started by John Crispin. (CC +John, Ralf, Jonas, linux-mips) > > (CC +Andrew, Ezequiel, James, James) > > On the talk of DT handover, this recent patchset adding support for a > system doing so to Linux is relevant: > > http://www.linux-mips.org/archives/linux-mips/2015-02/msg00312.html > > I'm also working on a system for which I'll need to implement DT > handover very soon. It would be very nice if we could agree on some > standard way of doing so (and eventually if the code on the Linux side > can be generic enough to allow a multiplatform kernel). > to be conformant with UHI I propose $a0 == -2 and $a1 == address of DT blob. It is a simple extension and should not interfere with the various legacy boot interfaces. U-Boot mainline code is almost ready for DT handover. I have prepared a patch [1] which completes it by implementing my proposal. [1] http://git.denx.de/?p=u-boot/u-boot-mips.git;a=commitdiff;h=3464e8de491c640d14d72853a741cc367ebabc79 -- - Daniel
