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- /*
- * LowLevel function for DataFlash environment support
- * Author : Gilles Gastaldi (Atmel)
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
- #include <common.h>
- #include <command.h>
- #include <environment.h>
- #include <linux/stddef.h>
- #include <dataflash.h>
- #include <search.h>
- #include <errno.h>
- DECLARE_GLOBAL_DATA_PTR;
- env_t *env_ptr;
- char *env_name_spec = "dataflash";
- uchar env_get_char_spec(int index)
- {
- uchar c;
- read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
- 1, (char *)&c);
- return c;
- }
- void env_relocate_spec(void)
- {
- ulong crc, new = 0;
- unsigned off;
- char buf[CONFIG_ENV_SIZE];
- /* Read old CRC */
- read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
- sizeof(ulong), (char *)&crc);
- /* Read whole environment */
- read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
- /* Calculate the CRC */
- off = offsetof(env_t, data);
- new = crc32(new, (unsigned char *)(buf + off), ENV_SIZE);
- if (crc == new)
- env_import(buf, 1);
- else
- set_default_env("!bad CRC");
- }
- #ifdef CONFIG_ENV_OFFSET_REDUND
- #error No support for redundant environment on dataflash yet!
- #endif
- int saveenv(void)
- {
- env_t env_new;
- int ret;
- ret = env_export(&env_new);
- if (ret)
- return ret;
- return write_dataflash(CONFIG_ENV_ADDR,
- (unsigned long)&env_new,
- CONFIG_ENV_SIZE);
- }
- /*
- * Initialize environment use
- *
- * We are still running from ROM, so data use is limited.
- * Use a (moderately small) buffer on the stack
- */
- int env_init(void)
- {
- /* use default */
- gd->env_addr = (ulong)&default_environment[0];
- gd->env_valid = 1;
- return 0;
- }
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