On Fri, Jun 17, 2016 at 01:44:18PM +0200, Maxime Coquelin wrote: > From: Lee Jones <lee.jo...@linaro.org> > > This patch fixes a non-booting issue in Mainline. > > When booting with a compressed kernel, we need to be careful how we > populate memory close to DDR start. AUTO_ZRELADDR is enabled by default > in multi-arch enabled configurations, which place some restrictions on > where the kernel is placed and where it will be uncompressed to on boot. > > AUTO_ZRELADDR takes the decompressor code's start address and masks out > the bottom 28 bits to obtain an address to uncompress the kernel to > (thus a load address of 0x42000000 means that the kernel will be > uncompressed to 0x40000000 i.e. DDR START on this platform). > > Even changing the load address to after the co-processor's shared memory > won't render a booting platform, since the AUTO_ZRELADDR algorithm still > ensures the kernel is uncompressed into memory shared with the first > co-processor (0x40000000). > > Another option would be to move loading to 0x4A000000, since this will > mean the decompressor will decompress the kernel to 0x48000000. However, > this would mean a large chunk (0x44000000 => 0x48000000 (64MB)) of > memory would essentially be wasted for no good reason. > > Until we can work with ST to find a suitable memory location to > relocate co-processor shared memory, let's disable the shared memory > nodes. This will ensure a working platform in the mean time. > > NB: The more observant of you will notice that we're leaving the DMU > shared memory node enabled; this is because a) it is the only one in > active use at the time of this writing and b) it is not affected by > the current default behaviour which is causing issues. > > Fixes: fe135c6 (ARM: dts: STiH407: Move over to using the 'reserved-memory' > API for obtaining DMA memory) > Signed-off-by: Lee Jones <lee.jo...@linaro.org> > Reviewed-by Peter Griffin <peter.grif...@linaro.org> > Signed-off-by: Maxime Coquelin <maxime.coque...@st.com>
Applied, thanks. -Olof
