Revision as of 07:48, 25 October 2017

Overall

This guide provides information which will help you choose a firmware upgrade way.

MASKROM

MASKROM is the simplest way. 

Belows are the advantages and disadvantages of using maskrom.

Advantages:

• Avoid brick
• Simple, unified

Disadvantages:

• Need a maskrom key

Support update from

• USB OTG

U-boot

Rockchip mainline u-boot have support various upgrade ways, such as rockusb/fastboot/ums, each of them could be used.

It could be entered by issuing "reboot ums/fastboot/rockusb" from linux, or add the board-spefic key-detection code.

It's also possible to do network/usb-disk upgrade in u-boot, though you must be familiar with u-boot to use them.

Belows are the advantages and disadvantages of using maskrom.

Advantages:

• Common

Disadvantages:

• Must be familiar with u-boot

Support update from

• USB OTG
• USB DISK
• Network

Linux

Both yocto and debian use deb as the package manager, so firmware upgrade could be done by deb installation.

(SDK build scripts can pack kernel/u-boot in deb）

Advantages:

• standard
• users-friendly

Disadvantages:

•  could be brick

SD-Card Recovery

By changing boot order in u-boot, it's possible to let u-boot load kernel and rootfs from sd-card at first.

We could use it to create a sd-card recovery image. When the board boot into sd-card, the init script run and install kernel/u-boot debian packages, which burn firmware to eMMC.

Advantages:

• Convenient
• Easy to customize

Disadvantages:

• Slow

Initramfs/Recovery

Advantages:

• Easy to customize
• Powerful

Disadvantages:

• Slow