U boot modellbausatz4/3/2023 ![]() The system should boot with purely running => setenv bootargs console=ttymxc0,115200 Installing new the system and monitor the u-boot output on a serial console Hit any key to stop autoboot: 0 For example to bypass the installed init system and drop to a root shell you may use: => setenv bootargs $ /boot/boot.scr flash-kernel Hit any key from the serial console to interrupt boot to drop to the u-boot prompt: " =>"įrom there you can add custom kernel arguments by adding aguments to the bootargs variable. When started and before booting into the OS u-boot will show a 3 seconds countdown: Hit any key to stop autoboot: 2 This should show you the version of u-boot being loaded.Īdditional kernel arguments can be given from u-boot before booting into the system by stopping normal boot and dropping to the u-boot prompt. Loading Device Tree to 4f3f4000, end 4f3fb5aa. Loading Ramdisk to 4f3fc000, end 4ffffddc. Mainline u-boot / new-style environment detected.ġ2598748 bytes read in 1137 ms (10.6 MiB/s)īooting Debian 3.16.0-4-armmp from mmc 0:1. *** Warning - bad CRC, using default environmentĪHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl SATA modeįlags: ncq stag pm led clo only pmp pio slum part ccc apst When booting u-boot from serial console, you should see output like the following: There are several console terminal programs in Debian that can attach to a serial connection, for example GNU Screen.įor a serial port you would use something like (please adapt to your serial adapter name in /dev): screen /dev/ttyS0 115200Īnd for an USB-TTL adapter: screen /dev/ttyUSB0 115200 Accessing the serial console varies greatly by board it often requires connecting a USB-TTL adapter to the ground, rx and tx pins on the board, but may instead use a 9-pin serial port with a null-modem cable. Typically, it involves using the "dd" command to write a u-boot image directly a raw SD card, or possibly flashing to NAND or other media.įor debugging u-boot, a serial console is usually required. There may be instructions for installing u-boot in the corresponding /usr/share/doc/u-boot*/README.Debian* files. To test u-boot packages from debian, install the u-boot or appropriate u-boot-VARIANT package for your board. Please also use the Debian bug tracking system for submitting other fixes to the Debian u-boot packages. If you'd like to get a support for a new board into Debian's u-boot, please get it in mainline u-boot and file a wishlist bug against u-boot: Support for boards enabled in the Debian u-boot packages should be in mainline u-boot, although backporting patches from newer versions of u-boot is a reasonable option: You can subscribe to get notifications by subscribing on the package tracker page. The current status page lists the last known working version for a variety of boards. ![]() Ideally each board gets tested every upload to the Debian archive, or at the very least once for each upstream version. ![]() The list of boards included in the Debian packages are in the debian/targets file: ![]() Since each u-boot target is fairly board-specific, often supporting only a single board, the u-boot maintainers require someone from the Debian community to be listed as a tester for each of the boards included in the Debian package. ![]()
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