Git Repo - u-boot.git/blame_incremental

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Commit	Line	Data
	1	/*
	2	* (C) Copyright 2000-2010
	3	* Wolfgang Denk, DENX Software Engineering, [email protected].
	4	*
	5	* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	6	* Andreas Heppel <[email protected]>
	7
	8	* SPDX-License-Identifier: GPL-2.0+
	9	*/
	10
	11	/*
	12	* 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <[email protected]>
	13	*
	14	* It might not be possible in all cases to use 'memcpy()' to copy
	15	* the environment to NVRAM, as the NVRAM might not be mapped into
	16	* the memory space. (I.e. this is the case for the BAB750). In those
	17	* cases it might be possible to access the NVRAM using a different
	18	* method. For example, the RTC on the BAB750 is accessible in IO
	19	* space using its address and data registers. To enable usage of
	20	* NVRAM in those cases I invented the functions 'nvram_read()' and
	21	* 'nvram_write()', which will be activated upon the configuration
	22	* #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
	23	* strongly dependent on the used HW, and must be redefined for each
	24	* board that wants to use them.
	25	*/
	26
	27	#include <common.h>
	28	#include <command.h>
	29	#include <environment.h>
	30	#include <linux/stddef.h>
	31	#include <search.h>
	32	#include <errno.h>
	33
	34	DECLARE_GLOBAL_DATA_PTR;
	35
	36	#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
	37	extern void nvram_read(void dest, const long src, size_t count);
	38	extern void nvram_write(long dest, const void *src, size_t count);
	39	env_t *env_ptr;
	40	#else
	41	env_t env_ptr = (env_t )CONFIG_ENV_ADDR;
	42	#endif
	43
	44	char *env_name_spec = "NVRAM";
	45
	46	#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
	47	uchar env_get_char_spec(int index)
	48	{
	49	uchar c;
	50
	51	nvram_read(&c, CONFIG_ENV_ADDR + index, 1);
	52
	53	return c;
	54	}
	55	#endif
	56
	57	void env_relocate_spec(void)
	58	{
	59	char buf[CONFIG_ENV_SIZE];
	60
	61	#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
	62	nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
	63	#else
	64	memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
	65	#endif
	66	env_import(buf, 1);
	67	}
	68
	69	int saveenv(void)
	70	{
	71	env_t env_new;
	72	int rcode = 0;
	73
	74	rcode = env_export(&env_new);
	75	if (rcode)
	76	return rcode;
	77
	78	#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
	79	nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE);
	80	#else
	81	if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL)
	82	rcode = 1;
	83	#endif
	84	return rcode;
	85	}
	86
	87	/*
	88	* Initialize Environment use
	89	*
	90	* We are still running from ROM, so data use is limited
	91	*/
	92	int env_init(void)
	93	{
	94	#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
	95	ulong crc;
	96	uchar data[ENV_SIZE];
	97
	98	nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong));
	99	nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE);
	100
	101	if (crc32(0, data, ENV_SIZE) == crc) {
	102	gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long);
	103	#else
	104	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
	105	gd->env_addr = (ulong)&env_ptr->data;
	106	#endif
	107	gd->env_valid = 1;
	108	} else {
	109	gd->env_addr = (ulong)&default_environment[0];
	110	gd->env_valid = 0;
	111	}
	112
	113	return 0;
	114	}