barebox

user:magic_variables

Sascha Hauer — 2012-04-15T00:58:53+02:00

Some variables in barebox have special meanings. These are listed here. Other than these variables there are device parameters. See here for more information on these. Also see the magicvar command which gives an overview about the magic variables that the current binary supports.

commands:iomem - created

Sascha Hauer — 2012-04-14T22:21:40+02:00

barebox supports dividing the iospsace into resources which can be requested by drivers. iomem gives an overview about these resources and their owners. example iomem 0x00000000 - 0xfffffffe (size 0xffffffff) iomem 0x1000a000 - 0x1000afff (size 0x00001000) imx_serial0 0x1000e000 - 0x1000efff (size 0x00001000) imx_spi0 0x10021000 - 0x10021fff (size 0x00001000) imxfb0 0x10024500 - 0x100244ff (size 0x00000000) ehci0 0x10024540 - 0x1002453f (size 0x00000000) ehci0 0x1002b000 - 0x1002bfff (size 0x00…

commands:magicvar - created

Sascha Hauer — 2012-04-14T22:19:29+02:00

Several environment variables in barebox have a special meaning for some commands. The magivar command lists all special variables along with their meaning.

filesystems:ramfs - created

Sascha Hauer — 2012-04-14T22:08:49+02:00

ramfs is a simple malloc based filesystem. An instance of ramfs is mounted during startup on /. The filesystemtype passed to mount is 'ramfs' example mount none ramfs /somedir

filesystems:fat - [example]

Sascha Hauer — 2012-04-14T22:02:14+02:00

barebox support the FAT filesystem including write support and long filenames. The filesystemtype passed to mount is 'fat'. example mount /dev/disk0.1 fat /mnt/fat bootm /mnt/fat/uImage

filesystems:tftp - created

Sascha Hauer — 2012-04-14T22:01:30+02:00

barebox supports tftp as a regular filesystem with both read and write support. The filesystemtype passed to mount is 'tftp'. tftp does not support listing directories, so a mounted tftp directory will appear empty, nevertheless the files are there.

commands:automount - created

Sascha Hauer — 2012-04-14T21:55:47+02:00

Automatically mount a device when a path is first accessed automount [OPTIONS] -l list current automountpoints -r remove a mountpoint With the automount command barebox maintains a list of pathes and associated commands. Whenever a path is first accessed the command is run. It's the commands responsibility to make this path available.

commands:addpart

Sascha Hauer — 2012-04-13T21:07:31+02:00

Add partitions to a device or file. addpart [OPTIONS] -n no prefix. Do not prepend the device name as prefix before the partition name device being worked on size1[@offset1](name1)[ro],size2[@offset2](name2)[ro],... The size and the offset can be given in decimal (without any prefix) and in hex (prefixed with 0x).

commands:bootm

Sascha Hauer — 2012-04-13T21:05:04+02:00

Boot an application image. This has become the standard image starting mechanism and it can start uImages aswell as zImages and barebox images. bootm [OPTIONS] image -c crc check uImage data -r specify an initrd image -L specify initrd load address -a specify os load address -e entry point to the image relative to start (0) -o specify oftree -v verbose -f fallback The bootm command automatically detects the image type. This work…

commands:ping - Remove wrong fact. It resends a ping packet after 10 seconds. Code will be changed, soon, nonetheless.

Wolfram Sang — 2012-04-04T12:34:37+02:00

ping HOST HOST can be an IP address or a host name. If a host name is specified, barebox tries to resolve that host name and exits with a failure if not successful.

boards:phytec_phycore_i_mx31 - created

Jochen Frieling — 2012-01-31T14:09:03+02:00

The CPU module This CPU card is based on a Freescale i.MX31 CPU. The card in configuration -0000REU is shipped with: * 128 MiB synchronous dynamic RAM (DDR type) * 64 MiB NAND flash * 32 MiB NOR flash * 512 kiB SRAM * 4kiB EEPROM * MMU, FPU * Serial, Ethernet, USB (OTG), I2C, SPI, MMC/SD/SDIO, PCMCIA/CF, RTC

commands:md - [Options:]

Sascha Hauer — 2012-01-31T12:39:31+02:00

md [OPTIONS] -s display file (default: /dev/mem) -b output in bytes -w output in halfwords (16 bit) -l output in words (32 bit) Display (hexdump) a memory region. Memory regions can be specified in two different forms: start+size or start-end, If is ommitted it defaults to 0. If end is omitted it defaults to the end of the device, except for interactive commands like md and mw for which it defaults to 0x100. Sizes can be specified as decimal, or if …

commands:timeout - [Options:]

Sascha Hauer — 2012-01-31T12:38:11+02:00

timeout [OPTIONS] -a interrupt on any key -c interrupt on ctrl-c -r interrupt on return -s silent mode Wait seconds for a timeout, return 1 on user intervention and 0 on timeout. example echo echo -n "Hit any key to stop autoboot: " timeout -a $autoboot_timeout if [ $? != 0 ]; then echo "autobooting aborted" exit fi

commands:memcpy - [memcpy]

Sascha Hauer — 2011-12-13T13:53:52+02:00

Copy to/from plain memory or files memcpy [OPTIONS] -b, -w, -l use byte, halfword, or word accesses -s source file (default /dev/mem) -d destination file (default /dev/mem) WIthout any options this command works like the standard memcpy C function. With the -s and -d options the source/destination file can be overwritten. This makes it possible to copy a memory area to a file or a file to a memory area.

developer:driver_model

Sascha Hauer — 2011-11-10T19:06:52+02:00

We follow a rather simplistic driver model here. There is a struct device_d which describes a particular device present in the system. A struct driver_d represents a driver present in the system. Both structs find together via the members 'type' (int) and 'name' (char *). If both members match, the driver's probe function is called with the struct device_d as argument. People familiar with the Linux platform bus will recognize this behaviour and in fact many things were stolen from there. Some s…