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https://github.com/brain-hackers/u-boot-brain
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9bf72ba6f6
CONFIG_SYS_SDRAM_BASE points to cached memory, i.e. KSEG0, which is not suitable for detecting memory size. Replace CONFIG_SYS_SDRAM_BASE with KSEG1, and make dram_init() always do memory size detection in any stage. Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
48 lines
1010 B
C
48 lines
1010 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018 Stefan Roese <sr@denx.de>
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*/
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#include <common.h>
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#include <init.h>
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#include <malloc.h>
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#include <asm/addrspace.h>
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#include <linux/bitops.h>
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#include <linux/io.h>
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#include <linux/sizes.h>
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DECLARE_GLOBAL_DATA_PTR;
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int dram_init(void)
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{
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gd->ram_size = get_ram_size((void *)KSEG1, SZ_256M);
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return 0;
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}
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int last_stage_init(void)
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{
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void *src, *dst;
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src = malloc(SZ_64K);
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dst = malloc(SZ_64K);
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if (!src || !dst) {
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printf("Can't allocate buffer for cache cleanup copy!\n");
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return 0;
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}
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/*
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* It has been noticed, that sometimes the d-cache is not in a
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* "clean-state" when U-Boot is running on MT7688. This was
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* detected when using the ethernet driver (which uses d-cache)
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* and a TFTP command does not complete. Copying an area of 64KiB
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* in DDR at a very late bootup time in U-Boot, directly before
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* calling into the prompt, seems to fix this issue.
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*/
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memcpy(dst, src, SZ_64K);
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free(src);
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free(dst);
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return 0;
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}
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