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common: board_r: add minimum nowhere env for board init. 

Storage env or kernel dtb load depends on bootdev, while bootdev
depends on env varname: devtype, devnum and rkimg_bootdev, etc.
So we have to use nowhere env firstly and cover the storage env
after it is loaded.

Providing a minimum and necessary nowhere env for board init to
avoid covering the other varnames in storage env.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I8362c24376e7530f15335f26197a7cddbcae579c
This commit is contained in:
Joseph Chen 2020-02-23 12:05:32 +08:00
parent 14569d2673
commit fc722856eb
1 changed files with 46 additions and 15 deletions
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61
common/board_r.c
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@ -493,23 +493,51 @@ static int initr_env(void)
#endif
#ifdef CONFIG_USING_KERNEL_DTB
/*
* If !defined(CONFIG_ENV_IS_NOWHERE):
*
* Storage env or kernel dtb load depends on bootdev, while bootdev
* depends on env varname: devtype, devnum and rkimg_bootdev, etc.
* So we have to use nowhere env firstly and cover the storage env
* after it is loaded.
*
* Providing a minimum and necessary nowhere env for board init to
* avoid covering the other varnames in storage env.
*/
static int initr_env_nowhere(void)
{
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
env_reloc();
env_htab.change_ok += gd->reloc_off;
#endif
#ifdef CONFIG_ENV_IS_NOWHERE
set_default_env(NULL);
return 0;
#else
const char env_minimum[] = {
ENV_MEM_LAYOUT_SETTINGS
#ifdef RKIMG_DET_BOOTDEV
RKIMG_DET_BOOTDEV
#endif
};
return set_board_env((char *)env_minimum, ENV_SIZE, 0, true);
#endif
}
#if !defined(CONFIG_ENV_IS_NOWHERE)
/*
* storage has been initialized in board_init(), we could switch env
* from nowhere to storage, i.e. CONFIG_ENV_IS_IN_xxx=y.
*/
static int initr_env_switch(void)
{
ALLOC_CACHE_ALIGN_BUFFER(env_t, env_nowhere, 1);
char *data;
int ret;
data = env_get("bootargs");
if (data) {
env_set("bootargs_tmp", data);
env_set("bootargs", NULL);
}
/* Export nowhere env for late use */
ret = env_export(env_nowhere);
if (ret) {
@ -521,8 +549,19 @@ static int initr_env_switch(void)
initr_env();
/* Append/override nowhere env to storage env */
himport_r(&env_htab, (char *)env_nowhere->data, ENV_SIZE, '\0',
H_NOCLEAR, 0, 0, NULL);
set_board_env((char *)env_nowhere->data, ENV_SIZE, H_NOCLEAR, false);
/*
* Restore nowhere bootargs to append/override the one in env storage.
*
* Without this, the entire "bootargs" in storage env is replaces by
* the one in env_nowhere->data.
*/
data = env_get("bootargs_tmp");
if (data) {
env_update("bootargs", data);
env_set("bootargs_tmp", NULL);
}
return 0;
}
@ -800,10 +839,6 @@ static init_fnc_t init_sequence_r[] = {
initr_dm,
#endif
/*
* kernel dtb must depends on nowhere to detect boot storage media
* and initialize it.
*/
#ifdef CONFIG_USING_KERNEL_DTB
initr_env_nowhere,
#endif
@ -815,10 +850,6 @@ static init_fnc_t init_sequence_r[] = {
board_init, /* Setup chipselects */
#endif
/*
* Now that storage has been initialized in board_init(), we could switch env
* from nowhere to storage, i.e. CONFIG_ENV_IS_IN_xxx=y.
*/
#if defined(CONFIG_USING_KERNEL_DTB) && !defined(CONFIG_ENV_IS_NOWHERE)
initr_env_switch,
#endif