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rockchip: rk3288: sdram: fix DDR address range

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The all current Rockchip SoCs supporting 4GB of ram have problems
accessing the memory region 0xfe000000~0xff000000. Actually, some IP
controller can't address to, so let's limit the available range.

This patch fixes a bug which found in miniarm-rk3288-4GB board. The
U-Boot was relocated to 0xfef72000, and .bss variants was also
relocated, such as do_fat_read_at_block. Once eMMC controller transfer
data to do_fat_read_at_block via DMA, DMAC can't access more than
0xfe000000. So that DMAC didn't work sane.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Xu Ziyuan 2016-09-05 09:39:58 +08:00 committed by Simon Glass
parent 45b047e557
commit 2179a07c0c
1 changed files with 4 additions and 3 deletions
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7
arch/arm/mach-rockchip/rk3288/sdram_rk3288.c
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@ -755,10 +755,11 @@ size_t sdram_size_mb(struct rk3288_pmu *pmu)
}
/*
* we use the 0x00000000~0xfeffffff space since 0xff000000~0xffffffff
* is SoC register space (i.e. reserved)
* we use the 0x00000000~0xfdffffff space since 0xff000000~0xffffffff
* is SoC register space (i.e. reserved), and 0xfe000000~0xfeffffff is
* inaccessible for some IP controller.
*/
size_mb = min(size_mb, 0xff000000 >> 20);
size_mb = min(size_mb, 0xfe000000 >> 20);
return size_mb;
}