- On ARMv7: LPAE seems to be not friendly that brings a lot of
compile errors.
- On ARMv8: MMU translate table is static defined by mem_map[]
and max 4GB as usual. It is not created dynamically according
to real memory size, that is different from ARMv7.
- 4GB memory is enough for U-Boot on both ARMv7 an ARMv8.
Considering all that, we decide to make max 4GB size to be visiable
for U-Boot, but still pass the real available memory size to kernel
by bidram_fixup() called at late before fixup "/memory" node.
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: Idd5fa769e940b0618446909f8f9edc39f596f072
Check if the region is overlap with reserved regions.
Change-Id: Ifd9b6a4438dcf954b7e48930e31d0c6cd5d1274c
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Some platform provides more than one dram banks and reserved firmware
regions (eg. ATF, OP-TEE, etc) by pre-loader dynamically. It means
there are memory holes in board dram layout. What's more, U-Boot will
reserved regions at the late bootflow(eg. firmware reserved for AMP).
So we introduce bidram mechanism to manage GD board bi_dram[], which
provides a way to easily manage memory holes and update bi_dram[]. It
dpends on LMB which provides a good algorithm to manage memory blocks.
What's different from sysmem?
- bidram manage and pass the avaliable memory blocks to kernel;
- sysmem is only for U-Boot memory management to avoid ram overlap,
it doesn't matter about kernel avaliable memory.
Change-Id: I697cbb80bdc961e4ad5ab94548e2dc93feefde6f
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Joseph Chen