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  • variant-emmc-nvme-boot
  • 2020-06-01
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env_nvram.c

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  • Forked from Reform / reform-boundary-uboot
    12222 commits behind the upstream repository.
    env_nvram.c 2.77 KiB
    /*
     * (C) Copyright 2000-2010
     * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
     *
     * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
     * Andreas Heppel <aheppel@sysgo.de>
    
     * SPDX-License-Identifier:	GPL-2.0+
     */
    
    /*
     * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
     *
     * It might not be possible in all cases to use 'memcpy()' to copy
     * the environment to NVRAM, as the NVRAM might not be mapped into
     * the memory space. (I.e. this is the case for the BAB750). In those
     * cases it might be possible to access the NVRAM using a different
     * method. For example, the RTC on the BAB750 is accessible in IO
     * space using its address and data registers. To enable usage of
     * NVRAM in those cases I invented the functions 'nvram_read()' and
     * 'nvram_write()', which will be activated upon the configuration
     * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
     * strongly dependent on the used HW, and must be redefined for each
     * board that wants to use them.
     */
    
    #include <common.h>
    #include <command.h>
    #include <environment.h>
    #include <linux/stddef.h>
    #include <search.h>
    #include <errno.h>
    
    DECLARE_GLOBAL_DATA_PTR;
    
    #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
    extern void *nvram_read(void *dest, const long src, size_t count);
    extern void nvram_write(long dest, const void *src, size_t count);
    env_t *env_ptr;
    #else
    env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
    #endif
    
    char *env_name_spec = "NVRAM";
    
    #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
    uchar env_get_char_spec(int index)
    {
    	uchar c;
    
    	nvram_read(&c, CONFIG_ENV_ADDR + index, 1);
    
    	return c;
    }
    #endif
    
    void env_relocate_spec(void)
    {
    	char buf[CONFIG_ENV_SIZE];
    
    #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
    	nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
    #else
    	memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
    #endif
    	env_import(buf, 1);
    }
    
    int saveenv(void)
    {
    	env_t	env_new;
    	int	rcode = 0;
    
    	rcode = env_export(&env_new);
    	if (rcode)
    		return rcode;
    
    #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
    	nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE);
    #else
    	if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL)
    		rcode = 1;
    #endif
    	return rcode;
    }
    
    /*
     * Initialize Environment use
     *
     * We are still running from ROM, so data use is limited
     */
    int env_init(void)
    {
    #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
    	ulong crc;
    	uchar data[ENV_SIZE];
    
    	nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong));
    	nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE);
    
    	if (crc32(0, data, ENV_SIZE) == crc) {
    		gd->env_addr	= (ulong)CONFIG_ENV_ADDR + sizeof(long);
    #else
    	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
    		gd->env_addr	= (ulong)&env_ptr->data;
    #endif
    		gd->env_valid	= 1;
    	} else {
    		gd->env_addr	= (ulong)&default_environment[0];
    		gd->env_valid	= 0;
    	}
    
    	return 0;
    }