[PATCH 11/17] ARM: mvebu: reserve the first 10 KB of each memory bank for suspend/resume

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 <redacted>
---
 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 <redacted>

Thanks,

Gregory


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com