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riscv: remove dram_init_banksize()

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Remove dram_init_banksize() on the architecture level.

Limiting used RAM to under 4 GiB is only necessary for CPUs which have a
DMA issue. SoC specific code already exists for FU540, FU740, JH7110.

Not all RISC-V boards will have memory below 4 GiB.

A weak implementation of dram_init_banksize() exists in common/board_f.c.

See the discussion in
https://lore.kernel.org/u-boot/545fe813-cb1e-469c-a131-0025c77aeaa2@canonical.com/T/

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Heinrich Schuchardt
2023-10-19 17:29:32 +08:00
committed by Leo Yu-Chi Liang
parent 9a0cf3993f
commit 9385c9b0cd
1 changed files with 0 additions and 16 deletions
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arch/riscv/cpu/generic/dram.c
-16
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@@ -20,19 +20,3 @@ int dram_init_banksize(void)
{
return fdtdec_setup_memory_banksize();
}
phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
{
/*
* Ensure that we run from first 4GB so that all
* addresses used by U-Boot are 32bit addresses.
*
* This in-turn ensures that 32bit DMA capable
* devices work fine because DMA mapping APIs will
* provide 32bit DMA addresses only.
*/
if (gd->ram_top >= SZ_4G)
return SZ_4G - 1;
return gd->ram_top;
}