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https://github.com/AsahiLinux/u-boot
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9814fb272f
With commit 06985289d4 ("watchdog: Implement generic watchdog_reset()
version") the init sequence has changed in arch_misc_init(), resulting
in a re-appearance of the d-cache issue on MT7688 boards (e.g. gardena).
When this happens, the first (or sometimes later ones as well) TFTP
command hangs and does not complete correctly. This leads to the
assumption that the d-cache is not in a clean state once the ethernet
driver is called (d-cache is used here for the buffers). The old work-
around with the cache flush somehow does not work any more now with
the new code change.
Unfortunately adding CONFIG_SYS_MALLOC_CLEAR_ON_INIT also did not fix
this issue. With v2019.07-rc3 it shows again. The time of accessing
the data seems to be very important here. It needs to be "very late"
in the boot process.
Testing has shown, that copying a 64KiB area in DDR at a very late
bootup time, directly before calling into the prompt, fixes this issue.
Flushing of the complete d-cache does not seem to necessary, as this
copy alone seems to fix this problem.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
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 <dm.h>
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#include <ram.h>
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#include <wdt.h>
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#include <asm/io.h>
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#include <linux/io.h>
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#include <linux/sizes.h>
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#include "mt76xx.h"
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#define STR_LEN 6
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#ifdef CONFIG_BOOT_ROM
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int mach_cpu_init(void)
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{
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ddr_calibrate();
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return 0;
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}
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#endif
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int dram_init(void)
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{
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gd->ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE, SZ_256M);
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return 0;
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}
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int print_cpuinfo(void)
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{
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static const char * const boot_str[] = { "PLL (3-Byte SPI Addr)",
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"PLL (4-Byte SPI Addr)",
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"XTAL (3-Byte SPI Addr)",
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"XTAL (4-Byte SPI Addr)" };
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const void *blob = gd->fdt_blob;
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void __iomem *sysc_base;
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char buf[STR_LEN + 1];
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fdt_addr_t base;
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fdt_size_t size;
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char *str;
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int node;
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u32 val;
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/* Get system controller base address */
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node = fdt_node_offset_by_compatible(blob, -1, "ralink,mt7620a-sysc");
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if (node < 0)
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return -FDT_ERR_NOTFOUND;
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base = fdtdec_get_addr_size_auto_noparent(blob, node, "reg",
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0, &size, true);
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if (base == FDT_ADDR_T_NONE)
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return -EINVAL;
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sysc_base = ioremap_nocache(base, size);
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str = (char *)sysc_base + MT76XX_CHIPID_OFFS;
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snprintf(buf, STR_LEN + 1, "%s", str);
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val = readl(sysc_base + MT76XX_CHIP_REV_ID_OFFS);
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printf("CPU: %-*s Rev %ld.%ld - ", STR_LEN, buf,
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(val & GENMASK(11, 8)) >> 8, val & GENMASK(3, 0));
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val = (readl(sysc_base + MT76XX_SYSCFG0_OFFS) & GENMASK(3, 1)) >> 1;
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printf("Boot from %s\n", boot_str[val]);
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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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