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ARM: imx: imx8m: Fix board_get_usable_ram_top()

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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 <marex@denx.de>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Frieder Schrempf <frieder.schrempf@kontron.de>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
This commit is contained in:
Marek Vasut 2022-04-14 15:51:46 +02:00 committed by Stefano Babic
parent 2e26a76eb0
commit 74f88b7221
1 changed files with 2 additions and 3 deletions
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5
arch/arm/mach-imx/imx8m/soc.c
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@ -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.