TF-A and SecureOS can allocate the part of DDR for self but U-Boot is not handling this configuration that the part of memory is reserved and shouldn't be used by U-Boot. That's why read all reserved memory locations and don't use it. The code was taken from commit 4a1b975dac02 ("board: stm32mp1: reserve memory for OP-TEE in device tree") and commit 1419e5b5167e ("stm32mp: update MMU config before the relocation") which is used by stm32 and does the job properly.
Signed-off-by: Michal Simek michal.simek@xilinx.com ---
board/xilinx/zynqmp/zynqmp.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c index 46dee80470fa..3fe0b0dc29f6 100644 --- a/board/xilinx/zynqmp/zynqmp.c +++ b/board/xilinx/zynqmp/zynqmp.c @@ -11,6 +11,8 @@ #include <env.h> #include <env_internal.h> #include <init.h> +#include <image.h> +#include <lmb.h> #include <log.h> #include <net.h> #include <sata.h> @@ -442,6 +444,25 @@ int dram_init(void)
return 0; } + +ulong board_get_usable_ram_top(ulong total_size) +{ + phys_size_t size; + phys_addr_t reg; + struct lmb lmb; + + /* found enough not-reserved memory to relocated U-Boot */ + lmb_init(&lmb); + lmb_add(&lmb, gd->ram_base, gd->ram_size); + boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob); + size = ALIGN(CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE), + reg = lmb_alloc(&lmb, size, MMU_SECTION_SIZE); + + if (!reg) + reg = gd->ram_top - size; + + return reg + size; +} #else int dram_init_banksize(void) {