Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [mmc]

17 questions
10
votes
1 answer

USB mmcblk support (realtek or others)

Can a USB card-reader ever appear as /dev/mmcblk0 and support the MMC ioctl commands? I see there are some kernel driver modules such as: rtsx_usb_sdmmc.ko (rtsx-usb-sdmmc) rtsx_usb.ko (rtsx-usb) Can these make a realtek card reader, attached to…
Gregor
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2
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0 answers

OS confusing eMMC device for SD card device - how to fix using udev

Busybox Linux running on an ARM Cortex A7 processor from NXP. The board has an SD card slot and also an eMMC chip that can be used for storage. The device is booting from nor flash. Strangely, when the SD card is inserted, we cannot mount the eMMC…
arcomber
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Reducing flash wear from Systemd Journald (embedded device)

I'm experimenting with Systemd and in particular Journald on a Yocto Poky (Linux) based embedded device with eMMC storage but I'm worried about flash wear since the write stats are excessively high as shown by both /sys/block/mmcblk0/stat and…
squashed
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1
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0 answers

Linux Mint 20.3 grub-install /dev/mmcblkX failed - fatal error

I've been beating my head against the keys trying to get Mint to install on an Acer 2-in-1. It does not have Legacy boot support and only has UEFI. I have made sure all BIOS options are correct such as disabling secure boot. I boot into the Linux…
mayce
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1
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0 answers

Mounting Overlay File System and Using rsync to sync changes doesn't work for me

I'm working on an embedded application using Raspberry Pi CM4 running DietPi OS. I want to minimize MMC flash writes as much as possible for maximum lifespan. In my installation, there are a few applications frequently writing data throughout the…
Jeepman03
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1
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1 answer

Failed to boot STM32mp157a-dk1 using a buildroot image

I'm trying to boot an STM32MP157a-dk1 using an image that i made with buildroot but when i boot i got this message : Unable to write "/uboot.env" from mmc0:4 Help me please !! H.M
ELmehdi
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1
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0 answers

Timeout Error while using Command Queue

I am new to command queue mechanism in Linux. I am using the following: Kernel Tree: git clone https://android.googlesource.com/kernel/msm Kernel Ver: 4.9.96 While doing read/write I observe a timeout error: mmc0: request with tag: 30 flags:…
nishad kamdar
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1
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0 answers

eMMC request timeout error

We have a custom embedded board with a 4GB eMMC chip connected. We see the following error while emmc read/write test on the eMMC device: mmc0: request with tag: 16 flags: 0x2000000002469030 timed out Can anyone suggest why this timeout may have…
nishad kamdar
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1
vote
1 answer

How to make multiple SLC region on eMMC User Area?

I have to partition (i.e hardware partition) the UDA (User Data Area) of the eMMC as follows: First 336MB region should be in pSLC. Next 2GB region as MLC partition. The remaining region again should be in pSLC mode. I have already done complete…
Ajith
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1
vote
1 answer

SD card issue in embedded linux

My setup: Embedded linux version 3.x on an ARM board with a SD card. After running for a couple of months, I am getting this print in the console. I want to understand this issue, and fix it. Following are the lines thrown by the kernel in…
BBM
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Using MMC in Dell 5070

I bought a DELL WYSE 5070 with built-in 16GB memory MMC and an M.2 128GB drive and have installed Debian on this machine. When I was installing proxmos, there was no way to install it on MMC so I installed it on the M.2 128GB drive from the command…
Desujusz
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0
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3 answers

MicroSD card not found at boot time, works when ejected and reinserted

I have a Jasper Lake mini PC with an Intel Micro SD card reader, running Ubuntu 22.04. If I have an SD card in the reader when I boot the machine, the card is not found, no block device is created, lsblk shows only the internal storage. If I remove…
ajh499
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0 answers

Test case for Deadline IO Scheduler

I am trying to measure the impact of Deadline IO scheduler on the performance of Block IO. My setup includes: Kernel Version: 4.4.154 Storage device: eMMC 64GB Distribution: VERSION="18.04.4 LTS (Bionic Beaver) I have tried the The Andrew Morton…
nishad kamdar
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0
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1 answer

** File not found /boot/uImage ** When using Angstrom Pre-built Images on BeagleBoneBlack Rev C

I'm trying to boot my BeagleBone Black into Angstrom using pre-built images found here. My SD card has two partitions BOOT & ROOTFS, and was formatted according to the procedures found here. Below are the contents of both partitions: The…
Niko_Jako
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0
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1 answer

Finding the manufacturer of the eMMC Host Controller for HP Stream 11 Pro G3 Notebook PC/82A9

I am trying to install Linux on an HP Stream 11 Pro G3 Notebook PC/82A9 and need the name of the manufacturer of the eMMC Host Controller so that I can figure out which drivers to enable in the Linux kernel.  Is there a way to find out?  I tried…
user229346
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