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arm: mvebu: turris_omnia: support invoking rescue boot from console 

Make it possible to invoke rescue boot from U-Boot console, without
having to press the factory reset button. This is needed when accessing
the device remotely, for example.

Achieve this by putting rescue command into `bootcmd_rescue` default
environment variable and setting some distroboot environment variables
to their default values when the factory button is pressed.

Rescue boot from console can be invoked by running
  run bootcmd_rescue

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Marek Behún 2021-05-28 10:00:49 +02:00 committed by Stefan Roese
parent 0b5bb36d13
commit 176c3e7760
2 changed files with 52 additions and 24 deletions
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53
board/CZ.NIC/turris_omnia/turris_omnia.c
View File

@ -337,29 +337,6 @@ static int set_regdomain(void)
return env_set("regdomain", rd);
}
/*
* default factory reset bootcommand on Omnia first sets all the front LEDs
* to green and then tries to load the rescue image from SPI flash memory and
* boot it
*/
#define OMNIA_FACTORY_RESET_BOOTCMD \
"i2c dev 2; " \
"i2c mw 0x2a.1 0x3 0x1c 1; " \
"i2c mw 0x2a.1 0x4 0x1c 1; " \
"mw.l 0x01000000 0x00ff000c; " \
"i2c write 0x01000000 0x2a.1 0x5 4 -s; " \
"setenv bootargs \"earlyprintk console=ttyS0,115200" \
" omniarescue=$omnia_reset rescue_mode=$omnia_reset\"; " \
"sf probe; " \
"sf read 0x1000000 0x100000 0x700000; " \
"lzmadec 0x1000000 0x1700000; " \
"if gpio input gpio@71_4; then " \
"bootm 0x1700000#sfp; " \
"else " \
"bootm 0x1700000; " \
"fi; " \
"bootz 0x1000000"
static void handle_reset_button(void)
{
int ret;
@ -375,8 +352,36 @@ static void handle_reset_button(void)
env_set_ulong("omnia_reset", reset_status);
if (reset_status) {
const char * const vars[3] = {
"bootcmd",
"bootcmd_rescue",
"distro_bootcmd",
};
/*
* Set the above envs to their default values, in case the user
* managed to break them.
*/
env_set_default_vars(3, (char * const *)vars, 0);
/* Ensure bootcmd_rescue is used by distroboot */
env_set("boot_targets", "rescue");
printf("RESET button was pressed, overwriting bootcmd!\n");
env_set("bootcmd", OMNIA_FACTORY_RESET_BOOTCMD);
} else {
/*
* In case the user somehow managed to save environment with
* boot_targets=rescue, reset boot_targets to default value.
* This could happen in subsequent commands if bootcmd_rescue
* failed.
*/
if (!strcmp(env_get("boot_targets"), "rescue")) {
const char * const vars[1] = {
"boot_targets",
};
env_set_default_vars(1, (char * const *)vars, 0);
}
}
}
#endif

23
include/configs/turris_omnia.h
View File

@ -108,12 +108,35 @@
#include <config_distro_bootcmd.h>
/*
* The factory reset bootcommand on Omnia first sets all the front LEDs to green
* and then tries to load the rescue image from SPI flash memory and boot it
*/
#define TURRIS_OMNIA_BOOTCMD_RESCUE \
"i2c dev 2; " \
"i2c mw 0x2a.1 0x3 0x1c 1; " \
"i2c mw 0x2a.1 0x4 0x1c 1; " \
"mw.l 0x01000000 0x00ff000c; " \
"i2c write 0x01000000 0x2a.1 0x5 4 -s; " \
"setenv bootargs \"earlyprintk console=ttyS0,115200" \
" omniarescue=$omnia_reset rescue_mode=$omnia_reset\"; " \
"sf probe; " \
"sf read 0x1000000 0x100000 0x700000; " \
"lzmadec 0x1000000 0x1700000; " \
"if gpio input gpio@71_4; then " \
"bootm 0x1700000#sfp; " \
"else " \
"bootm 0x1700000; " \
"fi; " \
"bootz 0x1000000"
#define CONFIG_EXTRA_ENV_SETTINGS \
RELOCATION_LIMITS_ENV_SETTINGS \
LOAD_ADDRESS_ENV_SETTINGS \
"fdtfile=" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0" \
"console=ttyS0,115200\0" \
"ethact=ethernet@34000\0" \
"bootcmd_rescue=" TURRIS_OMNIA_BOOTCMD_RESCUE "\0" \
BOOTENV
#endif /* CONFIG_SPL_BUILD */