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https://github.com/AsahiLinux/u-boot
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4415f1d1f1
Set up a location driver for each supported environment location. At present this just points to the global functions and is not used. A later patch will switch this over to use private functions in each driver. There are several special cases here in various drivers to handle peculiarities of certain boards: 1. Some boards define CONFIG_ENV_IS_IN_FAT and CONFIG_SPL_ENV_SUPPORT but do not actually load the environment in SPL. The env load code was optimised out before but with the driver, it is not. Therefore a special case is added to env/fat.c. The correct fix (depending on board testing might be to disable CONFIG_SPL_ENV_SUPPORT. 2. A similar situations happens with CONFIG_ENV_IS_IN_FLASH. Some boards do not actually load the environment in SPL, so to reduce code size we need to drop that code. A similar fix may be possible with these boards, or it may be possible to adjust the environment CONFIG settings. Added to the above is that the CONFIG_SPL_ENV_SUPPORT option does not apply when the environment is in flash. Obviously the above has been discovered through painful and time-consuming trial and error. Hopefully board maintainers can take a look and figure out what is actually needed. Signed-off-by: Simon Glass <sjg@chromium.org>
92 lines
1.7 KiB
C
92 lines
1.7 KiB
C
/*
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* LowLevel function for DataFlash environment support
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* Author : Gilles Gastaldi (Atmel)
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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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#include <dataflash.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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env_t *env_ptr;
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char *env_name_spec = "dataflash";
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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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read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
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1, (char *)&c);
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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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ulong crc, new = 0;
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unsigned off;
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char buf[CONFIG_ENV_SIZE];
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/* Read old CRC */
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read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
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sizeof(ulong), (char *)&crc);
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/* Read whole environment */
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read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
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/* Calculate the CRC */
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off = offsetof(env_t, data);
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new = crc32(new, (unsigned char *)(buf + off), ENV_SIZE);
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if (crc == new)
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env_import(buf, 1);
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else
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set_default_env("!bad CRC");
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}
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#ifdef CONFIG_ENV_OFFSET_REDUND
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#error No support for redundant environment on dataflash yet!
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#endif
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int saveenv(void)
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{
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env_t env_new;
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int ret;
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ret = env_export(&env_new);
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if (ret)
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return ret;
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return write_dataflash(CONFIG_ENV_ADDR,
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(unsigned long)&env_new,
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CONFIG_ENV_SIZE);
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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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int env_init(void)
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{
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/* use default */
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = ENV_VALID;
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return 0;
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}
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U_BOOT_ENV_LOCATION(dataflash) = {
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.location = ENVL_DATAFLASH,
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.get_char = env_get_char_spec,
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.load = env_relocate_spec,
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.save = env_save_ptr(saveenv),
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.init = env_init,
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};
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