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https://github.com/brain-hackers/u-boot-brain
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![Siva Durga Prasad Paladugu](/assets/img/avatar_default.png)
Assign default environment and set env valid during board_init_f before relocation as the actual environment will be read from eeprom later. Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com> Acked-by: Michal Simek <monstr@monstr.eu>
265 lines
5.5 KiB
C
265 lines
5.5 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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*
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* SPDX-License-Identifier: GPL-2.0+
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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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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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#include <i2c.h>
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#endif
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#include <search.h>
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#include <errno.h>
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#include <linux/compiler.h> /* for BUG_ON */
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DECLARE_GLOBAL_DATA_PTR;
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env_t *env_ptr;
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char *env_name_spec = "EEPROM";
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static int eeprom_bus_read(unsigned dev_addr, unsigned offset,
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uchar *buffer, unsigned cnt)
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{
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int rcode;
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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int old_bus = i2c_get_bus_num();
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if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
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i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
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#endif
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rcode = eeprom_read(dev_addr, offset, buffer, cnt);
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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i2c_set_bus_num(old_bus);
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#endif
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return rcode;
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}
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static int eeprom_bus_write(unsigned dev_addr, unsigned offset,
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uchar *buffer, unsigned cnt)
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{
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int rcode;
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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int old_bus = i2c_get_bus_num();
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if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
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i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
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#endif
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rcode = eeprom_write(dev_addr, offset, buffer, cnt);
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#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
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i2c_set_bus_num(old_bus);
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#endif
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return rcode;
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}
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uchar env_get_char_spec(int index)
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{
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uchar c;
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unsigned int off = CONFIG_ENV_OFFSET;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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if (gd->env_valid == 2)
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off = CONFIG_ENV_OFFSET_REDUND;
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#endif
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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off + index + offsetof(env_t, data), &c, 1);
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return c;
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}
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void env_relocate_spec(void)
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{
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char buf[CONFIG_ENV_SIZE];
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unsigned int off = CONFIG_ENV_OFFSET;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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if (gd->env_valid == 2)
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off = CONFIG_ENV_OFFSET_REDUND;
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#endif
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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off, (uchar *)buf, CONFIG_ENV_SIZE);
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env_import(buf, 1);
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}
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int saveenv(void)
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{
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env_t env_new;
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int rc;
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unsigned int off = CONFIG_ENV_OFFSET;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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unsigned int off_red = CONFIG_ENV_OFFSET_REDUND;
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char flag_obsolete = OBSOLETE_FLAG;
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#endif
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BUG_ON(env_ptr != NULL);
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rc = env_export(&env_new);
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if (rc)
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return rc;
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#ifdef CONFIG_ENV_OFFSET_REDUND
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if (gd->env_valid == 1) {
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off = CONFIG_ENV_OFFSET_REDUND;
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off_red = CONFIG_ENV_OFFSET;
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}
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env_new.flags = ACTIVE_FLAG;
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#endif
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rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
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off, (uchar *)&env_new, CONFIG_ENV_SIZE);
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#ifdef CONFIG_ENV_OFFSET_REDUND
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if (rc == 0) {
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eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
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off_red + offsetof(env_t, flags),
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(uchar *)&flag_obsolete, 1);
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if (gd->env_valid == 1)
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gd->env_valid = 2;
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else
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gd->env_valid = 1;
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}
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#endif
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return rc;
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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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* Use a (moderately small) buffer on the stack
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*/
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#ifdef CONFIG_ENV_OFFSET_REDUND
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int env_init(void)
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{
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#ifdef ENV_IS_EMBEDDED
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ulong len, crc[2], crc_tmp;
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unsigned int off, off_env[2];
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uchar buf[64], flags[2];
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int i, crc_ok[2] = {0, 0};
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eeprom_init(); /* prepare for EEPROM read/write */
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off_env[0] = CONFIG_ENV_OFFSET;
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off_env[1] = CONFIG_ENV_OFFSET_REDUND;
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for (i = 0; i < 2; i++) {
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/* read CRC */
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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off_env[i] + offsetof(env_t, crc),
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(uchar *)&crc[i], sizeof(ulong));
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/* read FLAGS */
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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off_env[i] + offsetof(env_t, flags),
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(uchar *)&flags[i], sizeof(uchar));
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crc_tmp = 0;
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len = ENV_SIZE;
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off = off_env[i] + offsetof(env_t, data);
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while (len > 0) {
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int n = (len > sizeof(buf)) ? sizeof(buf) : len;
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off,
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buf, n);
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crc_tmp = crc32(crc_tmp, buf, n);
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len -= n;
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off += n;
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}
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if (crc_tmp == crc[i])
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crc_ok[i] = 1;
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}
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if (!crc_ok[0] && !crc_ok[1]) {
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gd->env_addr = 0;
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gd->env_valid = 0;
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return 0;
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} else if (crc_ok[0] && !crc_ok[1]) {
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gd->env_valid = 1;
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} else if (!crc_ok[0] && crc_ok[1]) {
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gd->env_valid = 2;
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} else {
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/* both ok - check serial */
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if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
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gd->env_valid = 1;
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else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
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gd->env_valid = 2;
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else if (flags[0] == 0xFF && flags[1] == 0)
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gd->env_valid = 2;
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else if (flags[1] == 0xFF && flags[0] == 0)
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gd->env_valid = 1;
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else /* flags are equal - almost impossible */
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gd->env_valid = 1;
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}
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if (gd->env_valid == 2)
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gd->env_addr = off_env[1] + offsetof(env_t, data);
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else if (gd->env_valid == 1)
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gd->env_addr = off_env[0] + offsetof(env_t, data);
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#else
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 1;
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#endif
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return 0;
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}
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#else
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int env_init(void)
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{
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#ifdef ENV_IS_EMBEDDED
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ulong crc, len, new;
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unsigned off;
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uchar buf[64];
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eeprom_init(); /* prepare for EEPROM read/write */
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/* read old CRC */
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET + offsetof(env_t, crc),
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(uchar *)&crc, sizeof(ulong));
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new = 0;
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len = ENV_SIZE;
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off = offsetof(env_t, data);
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while (len > 0) {
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int n = (len > sizeof(buf)) ? sizeof(buf) : len;
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eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET + off, buf, n);
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new = crc32(new, buf, n);
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len -= n;
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off += n;
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}
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if (crc == new) {
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gd->env_addr = offsetof(env_t, data);
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gd->env_valid = 1;
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} else {
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gd->env_addr = 0;
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gd->env_valid = 0;
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}
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#else
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 1;
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#endif
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return 0;
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}
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#endif
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