ARM: uniphier: do not use RAM that exceeds 32 bit address range
LD20 / PXs3 boards are equipped with a large amount of memory beyond
the 32 bit address range. U-Boot relocates itself to the end of the
available RAM.
This is a problem for DMA engines that only support 32 bit physical
address, like the SDMA of SDHCI controllers.
In fact, U-Boot does not need to run at the very end of RAM. It is
rather troublesome for drivers with DMA engines because U-Boot does
not have API like dma_set_mask(), so DMA silently fails, making the
driver debugging difficult.
Hide the memory region that exceeds the 32 bit address range. It can
be done by simply carving out gd->ram_size. It would also possible to
override get_effective_memsize() or to define CONFIG_MAX_MEM_MAPPED,
but dram_init() is a good enough place to do this job.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
1 file changed