Firmware Upgrade

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Overall

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

 

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
  • friendly to the users

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 scripts in SD-Card can install kernel/u-boot deb  which will burn firmware to eMMC.

A sd-card recovery image could created by meta-rockchip-initramfs.

Advantages:

  • Convenient
  • Easy to customize, like a normal linux

Disadvantages:

  • Slow

 


Initramfs/Recovery

Advantages:

  • Easy to customize, like a normal linux
  • Powerful

Disadvantages:

  • Slow