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0answers
67 views

UBI layout volume not found

I am following Bootlin's embedded Linux training which aims to put an embedded Linux system on an Atmel SAMA5D4 Xplained board (theory slides, practical lab instructions) and I am stuck a putting the ...
3
votes
2answers
747 views

Reduce Boot time

I would be interested in finding ways to reduce the boot time, specially in embedded-related environments. I've read somewhere of a method to avoid the kernel to load some drivers or modules but I'm ...
0
votes
0answers
86 views

Linux kernel update

I'm trying to update the kernel version from 3.14 to 4.0.9 of Debian distribution. For boot I'm using U-Boot, and my microcontroller is imx6 (ARM architecture). I have the sources for the 4.0.9 ...
1
vote
2answers
224 views

How to see debug logs from Raspberry pi 3 during boot process?

I am currently trying to debug a "black screen" on a Raspberry Pi. The Pi is plugged to an in-house PCB using connector of the Pi and the LCD screen is connected on this in-house board. Now, ...
5
votes
1answer
64 views

How to force the execution of a script when / is not mounted?

I have bricked a linux embedded device. I was experimenting with it, and added my own path to /etc/ld.so.conf. The libc I included in my path is not compatible with this particular device, so I lost ...
0
votes
1answer
194 views

How can I boot alpine-linux from CF card (in Soekris net4801)?

I've installed according to https://wiki.alpinelinux.org/wiki/Create_a_Bootable_Compact_Flash#Automated and successfully activated serial console as outlined in https://wiki.alpinelinux.org/wiki/...
1
vote
0answers
43 views

How to make sure linux machine boots if RAID 1 boot drive fails

I am designing a system that includes a linux (Debian) based control computer. It will be deployed to a remote, inaccessible location. I want to set it up in such a way to maximize the chance that it ...
1
vote
0answers
37 views

Boot Linux from Linux on embedded board

I'd like to know, is there a way to boot a new Linux system, from a Linux ? Let me explain : I want to keep 2 systems separated on an embedded board. One system is used to perform tasks at the ...
7
votes
2answers
4k views

Linux kernel hangs at “Starting kernel …”

I have enabled Secure Boot on an embedded device successfully. The problem is that when I am booting in this mode the process seems to get stuck right after the line: Starting kernel ... once U-boot ...
4
votes
1answer
2k views

Systemd Boot Optimization dev-mmcblk0p2.device

I'm working on an embedded system and want to make it boot faster. I already stripped a lot of things. Now I don't know how to improve it further. Here is my systemd-analyze blame: 4.457s dev-...
0
votes
1answer
1k views

kernel panic not syncing: vfs :unable to mount root fs on unknown block(31,1)

I am trying to boot linux from flash on an powerpc board. In u-boot I set bootargs with: setenv bootargs root=/dev/mtdblock1 rootfstype=ext2 rw console=ttyS0,115200 ramdisk_image=\${rd_size} I also ...
2
votes
1answer
1k views

What are the two head.S files in linux source?

In the linux source there are two different head.S files located at: arch/arm/kernel/head.S arch/arm/boot/compressed/head.S What is the puprpose of each one and what is the order of there execution ...
1
vote
0answers
70 views

Get log from kernel while loading

There is a arm/omap2-based device without ethernet, UART ports. It has usb connection with host, numeric keyaboard, LCD display. There is working U-Boot and kernel images for this. I'm trying to ...
1
vote
1answer
886 views

WARNING: at kernel/irq/handle.c - after changing rootfs, but why?

today I changed from an image with initramfs to an image with separate kernel and rootfs. Theses images are used for an Embedded System (ARM9 SAM9G25), that is runnging with an Linux 2.6.39. During ...
0
votes
1answer
958 views

Having difficulties mounting a rootfs for an embedded Linux

I want my Kernel to start a squashfs rootfs for an embedded Linux. The squashfs file is on a sdcard, therefor i put these parameters on it's command line: console=ttyS0,115200 root=/dev/sdb1 rw ...
7
votes
3answers
13k views

Location of the kernel binary (when not in /boot)?

I failed to find the kernel binary in the standard location in /boot. I've also searched the whole file system for vmlinux or bzimage find / -iname vmlin* find / -iname bzimage However, this is an ...
4
votes
1answer
1k views

Making a recovery partition in embedded Linux

I have an Atmel SAM9X system running Angstrom. I am trying to make a recovery partition so when a user holds a button during boot up the recovery partition boots up. I have modified the bootstrap so ...
6
votes
2answers
7k views

Why is GRUB 2 booting so slowly?

I have a small custom embedded Linux distribution (created with OpenEmbedded), which boots with GRUB 1.99. The aim is to have it start up fast. Currently it says: GRUB loading. for ~2+ seconds (...
1
vote
1answer
156 views

Set runlevel at boot via hardware (analog) input, switch, etc.?

I've got pretty solid Linux experience, but little in the embedded/small system area, and this one has me baffled. I've agreed to help a friend work on a project using a tiny little x86-compatible ...
5
votes
3answers
12k views

Kernel panic - not syncing: No init found. While booting from U-Boot

Kernel mounted the root file system but can not find any init script. I'm sure that script exists in my ramdisk.img! I also checked out this and GE863-PRO3 U-BOOT Software User Guide 1VV0300777 Rev. ...
1
vote
1answer
111 views

Kernel - Starting the application

I placed the uBoot loader and the kernel into the raw flash image. This does not contain any root file system. (I copied uBoot and kernel image using dd command to a flash image). Now i have to ...
4
votes
2answers
978 views

Inittab seems to ignore remount,rw /

I have an embedded system that boots off compact flash and runs with the initrd.img ramdisk mounted as root. When booting, it mounts the initrd image ok in read only mode but then when inittab runs, ...
6
votes
2answers
2k views

Resources for very low-level (board bring-up)

I've worked with a few embedded systems, but now I'd like to make my own piece of hardware and despite a pretty thorough knowledge of Linux, I have no idea how to get Linux up and running on new ...