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[=#u-boot]
== U-Boot Bootloader
Gateworks supports the U-Boot Bootloader for the Malibu product family.

The purpose of a bootloader is to load the Linux kernel and execute it passing it configuration parameters such as an optional kernel command-line, an optional initial ramdisk filesystem, and a device-tree.

The following items are supported in the Gateworks U-Boot for Malibu:
 - eth0 (RGMII)
 - USB Host mode (USB Mass Storage and USB Networking for various USB Ethernet adapters supported by U-Boot
 - eMMC / microSD

The following items are not currently supported in the Gateworks U-Boot for Malibu:
- PCIe support
- USB device mode support (for USB OTG)


Additional resources:
 * [http://dev.gateworks.com/malibu/boot_firmware/ Pre-built boot firmware (updated from U-Boot/Linux)]
 * [http://dev.gateworks.com/malibu/images/ firmware-malibu* JTAG binaries]
 * [https://github.com/Gateworks/uboot-malibu source]

see [wiki:uboot] for more info


[=#default]
== Restoring defaults 
The Malibu boot firmware has a copy of the original U-Boot env that was created during build time.

To restore default bootloader environment variables:

- At the "Hit any key to stop autoboot:" prompt press any key.

- Execute the following command:
{{{#!bash
run restore_env && reset
}}}

== Editing the environment
If you would like to modify the default environment you can edit the [https://github.com/Gateworks/malibu-bsp/blob/main/malibu.env malibu.env] in the Malibu BSP.