/* * 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; }