imx8m: Restrict usable memory based on rom_pointer[0]
When TEE is loaded, we need to restrict the memory usage based
on rom_pointer[0]
Signed-off-by: Ying-Chun Liu (PaulLiu) <paulliu@debian.org>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Frieder Schrempf <frieder.schrempf@kontron.de>
Cc: uboot-imx <uboot-imx@nxp.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index f2ddc83..8635087 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -298,16 +298,26 @@
ulong board_get_usable_ram_top(ulong total_size)
{
+ ulong top_addr = PHYS_SDRAM + gd->ram_size;
+
/*
* Some IPs have their accessible address space restricted by
* the interconnect. Let's make sure U-Boot only ever uses the
* space below the 4G address boundary (which is 3GiB big),
* even when the effective available memory is bigger.
*/
- if (PHYS_SDRAM + gd->ram_size > 0x80000000)
- return 0x80000000;
+ if (top_addr > 0x80000000)
+ top_addr = 0x80000000;
- return PHYS_SDRAM + gd->ram_size;
+ /*
+ * rom_pointer[0] stores the TEE memory start address.
+ * rom_pointer[1] stores the size TEE uses.
+ * We need to reserve the memory region for TEE.
+ */
+ if (rom_pointer[0] && rom_pointer[1] && top_addr > rom_pointer[0])
+ top_addr = rom_pointer[0];
+
+ return top_addr;
}
static u32 get_cpu_variant_type(u32 type)