riscv: remove dram_init_banksize()
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>
diff --git a/arch/riscv/cpu/generic/dram.c b/arch/riscv/cpu/generic/dram.c
index 94d8018..1b51bae 100644
--- a/arch/riscv/cpu/generic/dram.c
+++ b/arch/riscv/cpu/generic/dram.c
@@ -20,19 +20,3 @@
{
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;
-}