The 4 GiB boundary is at 0xffffffff+1 , not at 0x80000000, fix this.
The PHYS_SDRAM of i.MX8M is at 0x40000000 , so to restrict ram_top
below 4 GiB, the ram_top has to be set to 0xffffffff as it is not
an offset from the start of PHYS_SDRAM, but rather a physical address
marking the topmost allowed DRAM address.
Fixes: e27bddff4b9 ("imx8m: Restrict usable memory to space below 4G boundary")
Signed-off-by: Marek Vasut <ma...@denx.de>
Cc: Fabio Estevam <feste...@denx.de>
Cc: Frieder Schrempf <frieder.schre...@kontron.de>
Cc: Peng Fan <peng....@nxp.com>
Cc: Stefano Babic <sba...@denx.de>
---
arch/arm/mach-imx/imx8m/soc.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index 8171631db10..e7fe7c2fd88 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -331,7 +331,7 @@ phys_size_t get_effective_memsize(void)
ulong board_get_usable_ram_top(ulong total_size)
{
- ulong top_addr = PHYS_SDRAM + gd->ram_size;
+ ulong top_addr;
/*
* Some IPs have their accessible address space restricted by
@@ -339,8 +339,7 @@ ulong board_get_usable_ram_top(ulong total_size)
* space below the 4G address boundary (which is 3GiB big),
* even when the effective available memory is bigger.
*/
- if (top_addr > 0x80000000)
- top_addr = 0x80000000;
+ top_addr = clamp_val((u64)PHYS_SDRAM + gd->ram_size, 0, 0xffffffff);
/*
* rom_pointer[0] stores the TEE memory start address.
--
2.35.1
