mirror of
https://github.com/AsahiLinux/u-boot
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df928f8549
After a successful upgrade, multiple problem during boot sequence may trigger the altbootcmd process. This patch adds a version and an upgrade_available entries to the bootcount file to enable/disable the bootcount check. When failing to read the bootcount file it will consider that bootcount is enabled, acting as previously, and update the file accordingly. The bootcount file is only saved when `upgrade_available` is true, this allows to save writes to the filesystem. Signed-off-by: Frédéric Danis <frederic.danis@collabora.com> Reviewed-by: Simon Glass <sjg@chromium.org>
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2017 General Electric Company. All rights reserved.
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*/
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#include <bootcount.h>
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#include <fs.h>
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#include <mapmem.h>
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#define BC_MAGIC 0xbd
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#define BC_VERSION 1
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typedef struct {
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u8 magic;
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u8 version;
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u8 bootcount;
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u8 upgrade_available;
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} bootcount_ext_t;
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static u8 upgrade_available = 1;
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void bootcount_store(ulong a)
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{
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bootcount_ext_t *buf;
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loff_t len;
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int ret;
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if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
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CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
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puts("Error selecting device\n");
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return;
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}
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/* Only update bootcount during upgrade process */
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if (!upgrade_available)
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return;
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buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, sizeof(bootcount_ext_t));
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buf->magic = BC_MAGIC;
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buf->version = BC_VERSION;
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buf->bootcount = (a & 0xff);
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buf->upgrade_available = upgrade_available;
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unmap_sysmem(buf);
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ret = fs_write(CONFIG_SYS_BOOTCOUNT_EXT_NAME,
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CONFIG_SYS_BOOTCOUNT_ADDR, 0, sizeof(bootcount_ext_t),
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&len);
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if (ret != 0)
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puts("Error storing bootcount\n");
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}
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ulong bootcount_load(void)
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{
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bootcount_ext_t *buf;
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loff_t len_read;
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int ret;
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if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
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CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
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puts("Error selecting device\n");
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return 0;
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}
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ret = fs_read(CONFIG_SYS_BOOTCOUNT_EXT_NAME, CONFIG_SYS_BOOTCOUNT_ADDR,
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0, sizeof(bootcount_ext_t), &len_read);
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if (ret != 0 || len_read != sizeof(bootcount_ext_t)) {
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puts("Error loading bootcount\n");
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return 0;
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}
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buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, sizeof(bootcount_ext_t));
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if (buf->magic == BC_MAGIC && buf->version == BC_VERSION) {
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upgrade_available = buf->upgrade_available;
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if (upgrade_available)
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ret = buf->bootcount;
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} else {
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puts("Incorrect bootcount file\n");
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}
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unmap_sysmem(buf);
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return ret;
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}
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