10/12/2023 0 Comments U boot configurationThis will make it easier to pull in future updates. Refer to the table in the wiki section of the repository to determine which branch you should use based on your SoC.Īfter you clone the repository and check out the correct branch, you may want to do is to create a new branch for your edits. The source code for u-boot is stored on github. I won’t be giving permission to edit env.← Back to RZ-G/RZ-G2_BSP_Porting Read First Is it possible to append the env to end of uboot i.e., env should be part of uboot binary? On every boot, uboot should use the default environment which is part of binary. Is it possible to use uboot default environment on every boot? i.e., uboot environment is not stored on a partition of flash. I am not sure if some step to clean the memory where the blob is loaded is missing before the tftp tranfer command. Ii u-boot-tools 2019.07+dfsg-1ubuntu6 amd64 companion tools for Das U-Boot bootloader TFTP from server 192.168.1.110 our IP address is 192.168.1.134Īs you can see, in both cases, variables are not all loaded as expected. I am trying to generate uEnv.txt with three variables defined: var1, var2 and var3. I have strange issues using this mkenvimage tool. It also allows to very easily generate a different environment image per-device, for example to contain the device MAC address and/or the device serial number. This utility has proven to be really useful, as it allows to automatically reflash a device with an environment know to work. Unfortunately, U-Boot has chosen to have a different environment layout in those two cases, so you must tell mkenvimage whether you’re using a redundant environment or a single environment. Another option worth having in mind is -r, which must be used when there are two copies of the environment stored in the flash thanks to the CONFIG_ENV_ADDR_REDUND and CONFIG_ENV_SIZE_REDUND. It must match the size of the flash area reserved for the U-Boot environment. The -s option allows to specify the size of the image to create. tools/mkenvimage -s 0x4200 -o uboot-env.bin uboot-env.txt With mkenvimage you can write a text file uboot-env.txt describing the environment, like: This utility has been merged into the U-Boot Git repository (see the commit) and will therefore be part of the next U-Boot release. For all of these cases, having a binary environment image is desirable.ĭavid Wagner, who has been an intern with us at Bootlin from April to September 2011, has written a utility called mkenvimage which just does this: generate a valid binary environment image from a text file describing the key=value pairs of the environment. Or, in factory, initial flashing of devices typically takes place either through specific CPU monitors, or through a JTAG interface. For example, on AT91 devices, the SAM-BA utility provided by Atmel is capable of completely reflashing an AT91 based system connected through the serial port of the USB device port. While this environment can easily be manipulated from U-Boot or from Linux using the above mentioned commands, it is sometimes desirable to be able to generate a binary image of an environment that can be directly flashed next to the bootloader, kernel and root filesystem into the device’s flash memory. The environment is basically stored as a sequence of null-terminated strings, with a little header containing a checksum at the beginning. This environment is typically stored in a specific flash location, defined in the board configuration header in U-Boot. This bootloader stores its configuration into an area of the flash called the environment that can be manipulated from within U-Boot using the printenv, setenv and saveenv commands, or from Linux using the fw_printenv and fw_setenv userspace utilities provided with the U-Boot source code. Many embedded devices these days use the U-Boot bootloader.
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