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https://github.com/AsahiLinux/u-boot
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890feecaab
Add another custom environment flag which discerns environment coming from external storage from environment set by U-Boot itself. Signed-off-by: Marek Vasut <marex@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000-2010
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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*/
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/*
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* 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
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*
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* It might not be possible in all cases to use 'memcpy()' to copy
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* the environment to NVRAM, as the NVRAM might not be mapped into
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* the memory space. (I.e. this is the case for the BAB750). In those
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* cases it might be possible to access the NVRAM using a different
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* method. For example, the RTC on the BAB750 is accessible in IO
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* space using its address and data registers. To enable usage of
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* NVRAM in those cases I invented the functions 'nvram_read()' and
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* 'nvram_write()', which will be activated upon the configuration
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* #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
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* strongly dependent on the used HW, and must be redefined for each
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* board that wants to use them.
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*/
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#include <common.h>
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#include <command.h>
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#include <env.h>
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#include <env_internal.h>
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#include <linux/stddef.h>
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#include <search.h>
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#include <errno.h>
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#include <u-boot/crc.h>
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
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extern void *nvram_read(void *dest, const long src, size_t count);
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extern void nvram_write(long dest, const void *src, size_t count);
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#else
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static env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
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#endif
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#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
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/** Call this function from overridden env_get_char_spec() if you need
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* this functionality.
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*/
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int env_nvram_get_char(int index)
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{
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uchar c;
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nvram_read(&c, CONFIG_ENV_ADDR + index, 1);
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return c;
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}
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#endif
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static int env_nvram_load(void)
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{
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char buf[CONFIG_ENV_SIZE];
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#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
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nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
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#else
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memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
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#endif
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return env_import(buf, 1, H_EXTERNAL);
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}
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static int env_nvram_save(void)
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{
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env_t env_new;
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int rcode = 0;
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rcode = env_export(&env_new);
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if (rcode)
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return rcode;
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#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
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nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE);
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#else
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if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL)
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rcode = 1;
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#endif
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return rcode;
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}
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/*
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* Initialize Environment use
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*
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* We are still running from ROM, so data use is limited
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*/
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static int env_nvram_init(void)
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{
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#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
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ulong crc;
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uchar data[ENV_SIZE];
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nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong));
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nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE);
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if (crc32(0, data, ENV_SIZE) == crc) {
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gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long);
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#else
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if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
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gd->env_addr = (ulong)&env_ptr->data;
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#endif
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gd->env_valid = ENV_VALID;
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} else {
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = ENV_INVALID;
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}
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return 0;
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}
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U_BOOT_ENV_LOCATION(nvram) = {
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.location = ENVL_NVRAM,
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ENV_NAME("NVRAM")
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.load = env_nvram_load,
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.save = env_save_ptr(env_nvram_save),
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.init = env_nvram_init,
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};
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