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https://github.com/brain-hackers/u-boot-brain
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b2cdef4861
With multiple environments, the 'get_char' callback for env drivers does not really make sense any more because it is only supported by two drivers (eeprom and nvram). To restore single character loading for these drivers, override 'env_get_char_spec'. Signed-off-by: Simon Goldschmidt <sgoldschmidt@de.pepperl-fuchs.com> Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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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 <environment.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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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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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);
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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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