How to update the uboot image to the sd card

HiFive Unmatched
1

hello

I ’ new in RISC-V，so I want to ask a question：how to update the uboot image to the sd card

2

This site

has info on how to build an image from scratch and has a lot of useful info about how things work. There is also a section near the end that talks about updating the uboot image on the sdcard. Basically, you just need to build u-boot, possibly with unmatched patches, and then use dd to copy two binaries to two partitions on the sdcard. These instructions were last updated about 8 months ago, there might be newer versions of some stuff available.

1 Like
3

There is also useful info in the HiFive Unmatched Software Reference Manual that you can find on the sifive site. Visit
https://www.sifive.com/boards/hifive-unmatched
and scroll to the bottom to find the link to the software reference manual.

1 Like
4

Thanks!
If it is a new sd card，is this method OK ？

5

Firstly, On a new SD card you can burn the official system image unmatched.wic.xz or your own built image ;

And then, Many partitions created on the sd card will be found out.
spl partition is in /dev/mmcblk0p1;
u-boot partition is in /dev/mmcblk0p2;

So, if you want to update the u-boot partition, just write that with “dd” command after you built a u-boot.itb

cd build/tmp-glibc/work/unmatched-oe-linux/u-boot/1_2022.04-r0/build
dd if=u-boot.itb of=/dev/mmcblk0p2 oflag=direct

# OR Update u-boot spl partition:
# cd spl
# dd if=u-boot-spl.bin of=/dev/mmcblk0p1 oflag=direct
6

Thank you！！！，It is useful for me！The file “unmatched.wic.xz” include spl、u-boot and OS？flash unmatched.wic.xz to the SD card, and can the boot to OS？

7

都有。
你动手试试就清楚了。

8

非常感谢~帮了大忙啦！ :heart_hands: