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imx8m: Restrict usable memory based on rom_pointer[0]

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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>
This commit is contained in:
Ying-Chun Liu (PaulLiu) 2021-08-23 10:43:06 +08:00 committed by Stefano Babic
parent 0cf5622998
commit 5a6af8c19a
1 changed files with 13 additions and 3 deletions
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16
arch/arm/mach-imx/imx8m/soc.c
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@ -298,16 +298,26 @@ phys_size_t get_effective_memsize(void)
ulong board_get_usable_ram_top(ulong total_size) 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 * Some IPs have their accessible address space restricted by
* the interconnect. Let's make sure U-Boot only ever uses the * the interconnect. Let's make sure U-Boot only ever uses the
* space below the 4G address boundary (which is 3GiB big), * space below the 4G address boundary (which is 3GiB big),
* even when the effective available memory is bigger. * even when the effective available memory is bigger.
*/ */
if (PHYS_SDRAM + gd->ram_size > 0x80000000) if (top_addr > 0x80000000)
return 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) static u32 get_cpu_variant_type(u32 type)