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fw_env: autodetect NAND erase size and env sectors

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As already done for NOR chips, if device ESIZE and ENVSECTORS static
configurations are both zero, then autodetect them at runtime.

Cc: Joe Hershberger <joe.hershberger@ni.com>
cc: Stefan Agner <stefan@agner.ch>
cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Anthony Loiseau <anthony.loiseau@allcircuits.com>
This commit is contained in:
Anthony Loiseau 2023-12-21 23:44:38 +01:00 • committed by Tom Rini
parent 9e3003f79d
commit d73a664186
2 changed files with 12 additions and 2 deletions
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3
tools/env/README vendored
View file

@ -58,6 +58,9 @@ DEVICEx_ENVSECTORS defines the number of sectors that may be used for
this environment instance. On NAND this is used to limit the range
within which bad blocks are skipped, on NOR it is not used.
If DEVICEx_ESIZE and DEVICEx_ENVSECTORS are both zero, then a runtime
detection is attempted for NOR and NAND mtd types.
To prevent losing changes to the environment and to prevent confusing the MTD
drivers, a lock file at /run/fw_printenv.lock is used to serialize access
to the environment.

11
tools/env/fw_env.c vendored
View file

@ -1652,8 +1652,15 @@ static int check_device_config(int dev)
}
DEVTYPE(dev) = mtdinfo.type;
if (DEVESIZE(dev) == 0 && ENVSECTORS(dev) == 0 &&
mtdinfo.type == MTD_NORFLASH)
DEVESIZE(dev) = mtdinfo.erasesize;
mtdinfo.erasesize > 0) {
if (mtdinfo.type == MTD_NORFLASH)
DEVESIZE(dev) = mtdinfo.erasesize;
else if (mtdinfo.type == MTD_NANDFLASH) {
DEVESIZE(dev) = mtdinfo.erasesize;
ENVSECTORS(dev) =
mtdinfo.size / mtdinfo.erasesize;
}
}
if (DEVESIZE(dev) == 0)
/* Assume the erase size is the same as the env-size */
DEVESIZE(dev) = ENVSIZE(dev);