# Raspberry Pi stuck in u-boot after mender update

**URL:** https://hub.mender.io/t/raspberry-pi-stuck-in-u-boot-after-mender-update/858
**Category:** General Discussions
**Created:** [July 26, 2019, 4:16pm UTC](https://hub.mender.io/t/raspberry-pi-stuck-in-u-boot-after-mender-update/858 "2019-07-26T16:16:18Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![alexandre\_cenareo](https://avatars.discourse-cdn.com/v4/letter/a/47e85d/32.png) [@alexandre\_cenareo](https://hub.mender.io/u/alexandre_cenareo)
#### Post date: [July 26, 2019, 4:16pm UTC](https://hub.mender.io/t/raspberry-pi-stuck-in-u-boot-after-mender-update/858/1 "2019-07-26T16:16:18Z")

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Hi,

We have been using mender as our update platform for 3 months now and we are quite happy about it.

But we recently encounter more and more player stuck in “Rebooting” state (99%) on mender UI and on the player, u-boot keep looping with message:

```auto
Saving Environment to MMC... Writing to redundant MMC(0)... WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm835_send_command()!
WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm835_send_command()!
WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm835_send_command()!
WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm835_send_command()!
WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm835_send_command()!
WARNING at drivers/mmc/bcm2835_sdhost.c:408/bcm835_send_command()!
failed
Failed (1)

```

A power reset fixes the problem and the raspberry boots in the upgraded rootfs.

Has anyone seen this or have any hints about it ?

Thank you very much !

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<div class="post-metadata">

### Author: ![alexandre\_cenareo](https://avatars.discourse-cdn.com/v4/letter/a/47e85d/32.png) [@alexandre\_cenareo](https://hub.mender.io/u/alexandre_cenareo)
#### Post date: [July 29, 2019, 1:01pm UTC](https://hub.mender.io/t/raspberry-pi-stuck-in-u-boot-after-mender-update/858/2 "2019-07-29T13:01:05Z")

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After using serial to debug u-boot, I’ve got another debug line:

```auto
Saving Environment to MMC... Writing to redundant MMC(0)... wait_transfer_complete - still waiting after 100001 retries
mmc write failed

```

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<div class="post-metadata">

### Author: ![mirzak](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/mirzak/32/2056_2.png) [@mirzak](https://hub.mender.io/u/mirzak)
#### Post date: [July 31, 2019, 10:58am UTC](https://hub.mender.io/t/raspberry-pi-stuck-in-u-boot-after-mender-update/858/3 "2019-07-31T10:58:08Z")

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The failure is at a very low level and looks to me like an hardware problem, e.g an issue with the SD cards or power supply.