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95fd977201
It can be useful to use the same U-Boot binary for multiple purposes, say the normal one, one for developers that allow breaking into the U-Boot shell, and one for use during bootstrapping which runs a special-purpose bootcmd. Or one can have several board variants that can share almost all boot logic, but just needs a few tweaks in the variables used by the boot script. To that end, allow the control dtb to contain a /config/enviroment node (or whatever one puts in fdt_env_path variable), whose property/value pairs are used to update the run-time environment after it has been loaded from its persistent location. The indirection via fdt_env_path is for maximum flexibility - for example, should the user wish (or board logic dictate) that the values in the DTB should no longer be applied, one simply needs to delete the fdt_env_path variable; that can even be done automatically by including a fdt_env_path = ""; property in the DTB node. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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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#include <env_callback.h>
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#include <linux/stringify.h>
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#ifdef DEFAULT_ENV_INSTANCE_EMBEDDED
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env_t embedded_environment __UBOOT_ENV_SECTION__(environment) = {
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ENV_CRC, /* CRC Sum */
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#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
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1, /* Flags: valid */
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#endif
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{
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#elif defined(DEFAULT_ENV_INSTANCE_STATIC)
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static char default_environment[] = {
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#elif defined(DEFAULT_ENV_IS_RW)
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uchar default_environment[] = {
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#else
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const uchar default_environment[] = {
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#endif
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#ifndef CONFIG_USE_DEFAULT_ENV_FILE
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#ifdef CONFIG_ENV_CALLBACK_LIST_DEFAULT
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ENV_CALLBACK_VAR "=" CONFIG_ENV_CALLBACK_LIST_DEFAULT "\0"
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#endif
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#ifdef CONFIG_ENV_FLAGS_LIST_DEFAULT
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ENV_FLAGS_VAR "=" CONFIG_ENV_FLAGS_LIST_DEFAULT "\0"
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#endif
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#ifdef CONFIG_USE_BOOTARGS
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"bootargs=" CONFIG_BOOTARGS "\0"
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#endif
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#ifdef CONFIG_BOOTCOMMAND
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"bootcmd=" CONFIG_BOOTCOMMAND "\0"
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#endif
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#ifdef CONFIG_RAMBOOTCOMMAND
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"ramboot=" CONFIG_RAMBOOTCOMMAND "\0"
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#endif
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#ifdef CONFIG_NFSBOOTCOMMAND
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"nfsboot=" CONFIG_NFSBOOTCOMMAND "\0"
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#endif
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#if defined(CONFIG_BOOTDELAY)
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"bootdelay=" __stringify(CONFIG_BOOTDELAY) "\0"
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#endif
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#if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
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"baudrate=" __stringify(CONFIG_BAUDRATE) "\0"
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#endif
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#ifdef CONFIG_LOADS_ECHO
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"loads_echo=" __stringify(CONFIG_LOADS_ECHO) "\0"
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#endif
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#ifdef CONFIG_ETHPRIME
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"ethprime=" CONFIG_ETHPRIME "\0"
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#endif
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#ifdef CONFIG_IPADDR
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"ipaddr=" __stringify(CONFIG_IPADDR) "\0"
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#endif
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#ifdef CONFIG_SERVERIP
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"serverip=" __stringify(CONFIG_SERVERIP) "\0"
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#endif
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#ifdef CONFIG_SYS_AUTOLOAD
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"autoload=" CONFIG_SYS_AUTOLOAD "\0"
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#endif
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#ifdef CONFIG_PREBOOT
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"preboot=" CONFIG_PREBOOT "\0"
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#endif
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#ifdef CONFIG_ROOTPATH
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"rootpath=" CONFIG_ROOTPATH "\0"
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#endif
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#ifdef CONFIG_GATEWAYIP
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"gatewayip=" __stringify(CONFIG_GATEWAYIP) "\0"
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#endif
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#ifdef CONFIG_NETMASK
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"netmask=" __stringify(CONFIG_NETMASK) "\0"
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#endif
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#ifdef CONFIG_HOSTNAME
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"hostname=" CONFIG_HOSTNAME "\0"
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#endif
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#ifdef CONFIG_BOOTFILE
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"bootfile=" CONFIG_BOOTFILE "\0"
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#endif
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#ifdef CONFIG_LOADADDR
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"loadaddr=" __stringify(CONFIG_LOADADDR) "\0"
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#endif
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#if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0)
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"pcidelay=" __stringify(CONFIG_PCI_BOOTDELAY)"\0"
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#endif
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#ifdef CONFIG_ENV_VARS_UBOOT_CONFIG
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"arch=" CONFIG_SYS_ARCH "\0"
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#ifdef CONFIG_SYS_CPU
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"cpu=" CONFIG_SYS_CPU "\0"
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#endif
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#ifdef CONFIG_SYS_BOARD
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"board=" CONFIG_SYS_BOARD "\0"
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"board_name=" CONFIG_SYS_BOARD "\0"
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#endif
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#ifdef CONFIG_SYS_VENDOR
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"vendor=" CONFIG_SYS_VENDOR "\0"
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#endif
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#ifdef CONFIG_SYS_SOC
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"soc=" CONFIG_SYS_SOC "\0"
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#endif
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#ifdef CONFIG_ENV_IMPORT_FDT
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"env_fdt_path=" CONFIG_ENV_FDT_PATH "\0"
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#endif
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#endif
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#if defined(CONFIG_BOOTCOUNT_BOOTLIMIT) && (CONFIG_BOOTCOUNT_BOOTLIMIT > 0)
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"bootlimit=" __stringify(CONFIG_BOOTCOUNT_BOOTLIMIT)"\0"
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#endif
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#ifdef CONFIG_EXTRA_ENV_SETTINGS
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CONFIG_EXTRA_ENV_SETTINGS
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#endif
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"\0"
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#else /* CONFIG_USE_DEFAULT_ENV_FILE */
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#include "generated/defaultenv_autogenerated.h"
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#endif
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#ifdef DEFAULT_ENV_INSTANCE_EMBEDDED
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}
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#endif
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};
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