u-boot Questions
1
I need to create a 3-step macro in U-Boot:
Use dhcp to download an image to memory. This sets filesize
Test if $filesize > $SOMELIMIT, print a message, and stop
Would write the downloaded image...
Bicorn asked 14/3 at 20:38
3
Solved
I am confused in clearing my concepts regarding these three questions
why do we need a secondary program loader ?
in which memory it gets loaded and relocated ?
what is the difference between sy...
Tater asked 6/7, 2015 at 11:36
2
Solved
While building the kernel I am giving LOADADDR as "0x80008000":
make uImage LOADADDR=0x80008000
Can you please help to understand what is the use of this? Can I change the LOADADDR, is there any...
Claret asked 30/7, 2015 at 13:49
1
I made a copy of the dts from <linux>/board/arch/arm/boot/dts/imx28-evk.dts for using with my custom board. My custom device-tree is named imx28-custom.dts and is pointed in the Out of tree c...
2
I would like, from my u-boot script, to check the existence of a file on a device before running the image on this device.
Indeed, this would ensure to have access to the requested device before bo...
5
Solved
I am building a Yocto image for Intel Edison.
One of the image's components is u-boot with an Edison-specific patch. By default, Edison's UART port is used for u-boot console. I want to disable th...
Defrayal asked 18/12, 2015 at 13:28
4
Solved
I am working with an embedded linux kit that is running u-boot. In order to get everything booting properly, I had to modify some environment variables and store them with the 'saveenv' command.
N...
Lapin asked 16/12, 2013 at 22:8
1
Solved
I am compiling a linux kernel using mipsel toolchain.
Everything works fine except at the very last point which states invalid entry point:
sh: 0: Can't open /arch/mips/boot/tools/entry
rm -f arch/...
Wearproof asked 26/12, 2020 at 23:28
2
My machine Ubuntu 16.04.3 LTS x86_64.
I do compile u-boot-2017.11 and I got the error.
u-boot-2017.11$ export ARCH=arm
u-boot-2017.11$ export CROSS_COMPILE=/opt/toolchains/gcc-linaro-4.9.4-2017.0...
Anthropocentric asked 13/12, 2017 at 7:22
2
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I have an SD card with a standard Beaglebone Debian image. I also have the MLO and u-boot.img files from building u-boot. I'd like to install the new u-boot on the SD card and then flash the modifi...
Howerton asked 26/3, 2020 at 17:35
1
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The old versions show am335x_boneblack_defconfig(branch v2017.01 instead of the master) file inside the directory but I am not able to see it in the newer version.So which branch should I use to bu...
Apostle asked 22/3, 2020 at 21:22
8
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Does anyone know of a way to get U-boot version installed from userspace? There is the fw_printenv command that provides access to U-boot's environment variables, but not the version.
Culliton asked 25/4, 2011 at 18:35
10
In my ARM based custom board, I flash u-boot to NAND whenever I do changes on that. (putting some debug statements/modification). Is there any way to directly load the uboot image in RAM memory ins...
Plenipotentiary asked 7/3, 2011 at 10:22
2
As per my understanding chosen node is used to send boot arguments to the kernel.
The following is the chosen node of the existing device code (am335x-bone-common.dtsi).
chosen {
stdout-path = &a...
Stereochromy asked 15/2, 2018 at 7:32
1
I have some experience compiling bare metal code for ARM cortex-m devices as well as the Linux kernel, uBoot, and applications for the Beaglebone Black (BBB) (more featured ARM with MMU, for those ...
2
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I spend a few days trying to understand but I'm stuck.
I get no more than a "Starting kernel..." message after entering 'bootm 8100000' on my STM32F429I-DISC1 board.
Before I update uboot from 201...
Vories asked 25/12, 2016 at 14:31
2
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I'am trying to learn the difference between a zImage and a uImage.
In my understanding uImage is got by running mkimage on the Image and as a result it adds a U-Boot wrapper (i don't know what it ...
Phase asked 25/7, 2017 at 22:8
3
Solved
Bootloaders like U-Boot that do not implement the Open Firmware API, are expected to pass to the kernel a binary form of the flattened device tree - LinuxFDTBlob
Why are the DTS files present i...
Ecbolic asked 8/6, 2015 at 14:6
3
This one is a basic question related to u-boot.
Why does the u-boot code relocate itself ?
Ok, it makes sense if u-boot is executing from NOR-flash or boot ROM space but if it runs from SDRAM alr...
Perretta asked 23/5, 2013 at 17:10
1
Solved
I am making my own Linux distribution. The development is going along nicely however i find it hard to understand the difference between the kernel load address and the entry point.
In order for ...
Rovner asked 4/4, 2017 at 10:35
3
I am trying to get my own build of U-Boot to boot Linux on a Jetson TK1 board. As we are pushing for verified boot I am using the Flat Image Tree (unifying kernel image, device tree blob, ...) to d...
Impassable asked 29/10, 2014 at 9:15
2
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I'm very confused on these two files for the boot configuration. They seem to be doing the same thing and I don't understand why I would need either or.
If I use uEnv.txt, I set it as
bootargs=c...
Tingle asked 6/3, 2015 at 2:3
3
Solved
Newbie question here.
I'm looking at a u-boot boardfile, and it has many functions in it.
For example; board_mmc_init(), enet_board_init(), setup_splash_img(), etc.
Most of these functions don't ge...
Riocard asked 27/8, 2013 at 10:5
2
Solved
In U-Boot I have these two environment variables:
filepath=myimages
kernelfile=${filepath}/uImage.bin
When I run this command:
echo ${kernelfile}
I get this output:
${filepath}/uImage.bin
...
Verb asked 29/7, 2015 at 23:1
1
Solved
I don't understand what is happening in RAM when loading U-Boot. I'm working on a Xilinx Zynq ZC702 evaluation kit and I'm trying to load a Linux kernel on it using U-Boot. So I used the Xilinx too...
Toxicant asked 11/2, 2016 at 10:37
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