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env: mmc: statically set the environment partition name

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The new opt-out setting, CONFIG_ENV_MMC_PARTITION, statically sets
the MMC environment partition name. Prior to this patch, the only way
to declare this partition name was by creating a
'u-boot,mmc-env-partition' parameter in the device-tree's /config node.

This setting provides additional flexibility, particularly in cases
where accessing the device-tree is not straightforward (e.g. QEMU).

If undeclared, the device-tree's setting will be used.

Signed-off-by: Emmanuel Di Fede <emmanuel.difede@cysec.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Emmanuel Di Fede 2023-06-14 12:05:28 +02:00 committed by Tom Rini
parent b1d774bb87
commit 9e70676cf5
3 changed files with 19 additions and 0 deletions
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2
doc/device-tree-bindings/config.txt
View file

@ -76,6 +76,8 @@ u-boot,mmc-env-partition (int)
precedence. In that case, only if the partition is not found,
mmc-env-offset* will be tried.
Note that CONFIG_ENV_MMC_PARTITION overrides this device-tree setting.
u-boot,no-apm-finalize (bool)
For x86 devices running on coreboot, this tells U-Boot not to lock
down the Intel Management Engine (ME) registers. This allows U-Boot to

12
env/Kconfig vendored
View file

@ -662,6 +662,18 @@ config SYS_MMC_ENV_PART
partition 0 or the first boot partition, which is 1 or some other defined
partition.
config USE_ENV_MMC_PARTITION
bool "use the mmc environment partition name"
depends on ENV_IS_IN_MMC
config ENV_MMC_PARTITION
string "mmc environment partition name"
depends on USE_ENV_MMC_PARTITION
help
MMC partition name used to save environment variables.
If this variable is unset, u-boot will try to get the env partition name
from the device-tree's /config node.
config ENV_MMC_USE_DT
bool "Read partition name and offset in DT"
depends on ENV_IS_IN_MMC && OF_CONTROL

5
env/mmc.c vendored
View file

@ -114,8 +114,13 @@ static inline s64 mmc_offset(struct mmc *mmc, int copy)
if (IS_ENABLED(CONFIG_SYS_MMC_ENV_PART))
hwpart = mmc_get_env_part(mmc);
#if defined(CONFIG_ENV_MMC_PARTITION)
str = CONFIG_ENV_MMC_PARTITION;
#else
/* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
str = ofnode_conf_read_str(dt_prop.partition);
#endif
if (str) {
/* try to place the environment at end of the partition */
err = mmc_offset_try_partition(str, copy, &val);