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.si...@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)
{
--
2.31.1
