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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