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rockchip: sdram: Limit usable ram_top to max 4G

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U-Boot only works correctly when it uses RAM below the 4G address
boundary on Rockchip SoCs. Limit usable gd->ram_top to max 4G.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Jonas Karlman 2025-01-30 22:07:12 +00:00 committed by Kever Yang
parent 57ad1ed7e8
commit 356236126d
1 changed files with 2 additions and 1 deletions
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3
arch/arm/mach-rockchip/sdram.c
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@ -487,7 +487,8 @@ int dram_init(void)
phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
{
unsigned long top = CFG_SYS_SDRAM_BASE + SDRAM_MAX_SIZE;
/* Make sure U-Boot only uses the space below the 4G address boundary */
u64 top = min_t(u64, CFG_SYS_SDRAM_BASE + SDRAM_MAX_SIZE, SZ_4G);
return (gd->ram_top > top) ? top : gd->ram_top;
}