From: Clayton Casciato <majortomtosourcecontrol@gmail.com>
To: "Robert P. J. Day" <rpjday@crashcourse.ca>,
OE Core mailing list <openembedded-core@lists.openembedded.org>
Subject: Re: [OE-core] probably a simple question regarding running "fw_printenv" on SD card partition
Date: Sat, 7 Feb 2026 08:13:03 -0700 [thread overview]
Message-ID: <c5abc604-1758-484e-ac1f-e6c956bf37f3@gmail.com> (raw)
In-Reply-To: <0b4b896b-3101-ab92-1911-21c3622f9a7a@crashcourse.ca>
> i've tried various combinations in that config file, including stuff
> like:
>@
> # MTD device name Device offset Env. size Flash sector size
> /dev/mmcblk0p7 0x7e000 0x2000 0x200
>@
Hi, Robert
You specify the device offset, so the block device [1] should not also
specify a partition.
The flash sector size should not be specified.
Double check CONFIG_ENV_IS_IN_MMC [2], CONFIG_ENV_OFFSET [3], and
CONFIG_ENV_SIZE [4].
With CONFIG_ENV_IS_IN_MMC [5]:
"[ENV_OFFSET and ENV_SIZE] are in units of bytes, but must be aligned to
an MMC sector boundary."
[1] https://github.com/u-boot/u-boot/blob/v2025.01/tools/env/fw_env.config#L25
[2] https://github.com/u-boot/u-boot/blob/v2025.01/env/Kconfig#L193
[3] https://github.com/u-boot/u-boot/blob/v2025.01/env/Kconfig#L564
[4] https://github.com/u-boot/u-boot/blob/v2025.01/env/Kconfig#L601
[5] https://github.com/u-boot/u-boot/blob/v2025.01/env/Kconfig#L229-L230
Clayton Casciato
prev parent reply other threads:[~2026-02-07 15:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-06 18:19 probably a simple question regarding running "fw_printenv" on SD card partition Robert P. J. Day
2026-02-07 15:13 ` Clayton Casciato [this message]
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