Hi Thomas, On 24/10/2014 13:59, Thomas Petazzoni wrote: > When going out of suspend to RAM, the Marvell EBU platforms go through > the bootloader, which re-configures the DRAM controller. To achieve > this, the bootloader executes a piece of code called the "DDR3 > training code". It does some reads/writes to the memory to find out > the optimal timings for the memory chip being used. > > This has the nasty side effect that the first 10 KB of each DRAM > chip-select are overwritten by the bootloader when exiting the suspend > to RAM state. > > Therefore, this commit implements the ->reserve() hook for the 'struct > machine_desc' used on Armada XP, to reserve the 10 KB of each DRAM > chip-select using the memblock API. > > Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> > --- > arch/arm/mach-mvebu/board-v7.c | 51 ++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 51 insertions(+) It is unfortunate to put these "holes" in the memory but it is a design constraint. However, your solution is nice and very well contained however. Acked-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx> Thanks, Gregory -- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
