The board_get_usable_ram_top() function is used by boards to compute uppermost address of RAM(ram_top) that is to be used by U-Boot -- this need not be the highest RAM address of the platform. This computation happens before U-Boot relocates to its final destination address in RAM. Certain platforms, like the Xilinx boards were computing the ram_top value in an indirect manner, through some LMB API's. Thus it is no longer possible to use these LMB API's to compute the ram_top, as the LMB module gets initialised only after relocation, and the heap memory has been set up. Add generic functionality to compute the value of ram_top which can be used by platforms.
Sughosh Ganu (2): common: memtop: add logic to detect ram_top xilinx: use get_mem_top() to compute ram_top
board/xilinx/common/board.c | 25 +++++ common/Makefile | 1 + common/memtop.c | 186 ++++++++++++++++++++++++++++++++++++ include/memtop.h | 22 +++++ 4 files changed, 234 insertions(+) create mode 100644 common/memtop.c create mode 100644 include/memtop.h