Bozza Posted October 17, 2020 Share Posted October 17, 2020 Hello everybody is there a good tutorial to compile u-boot.ext? Or are there perhaps any quality sources that already have u-boot.ext files? Thank you Link to comment Share on other sites More sharing options...
jock Posted October 17, 2020 Share Posted October 17, 2020 9 hours ago, Bozza said: Hello everybody is there a good tutorial to compile u-boot.ext? Or are there perhaps any quality sources that already have u-boot.ext files? Thank you What is u-boot.ext ?!? Link to comment Share on other sites More sharing options...
Bozza Posted October 18, 2020 Author Share Posted October 18, 2020 It is the bootloader. Link to comment Share on other sites More sharing options...
SteeMan Posted October 18, 2020 Share Posted October 18, 2020 More specifically, balbes uses a second stage bootloader in a file named u-boot.ext for the amlogic platform in his builds. Link to comment Share on other sites More sharing options...
hexdump Posted October 18, 2020 Share Posted October 18, 2020 i think this was due to amlogic messing up the video mode with current mainline kernels in later versions of their legacy u-boot - the solution was to chainload a u-boot which sets the video mode properly (no more false colors) from the legacy u-boot on the box ... Link to comment Share on other sites More sharing options...
hanguofu Posted October 18, 2020 Share Posted October 18, 2020 Hi , hexdump : Do you know the related code about setting video mode ? I would like to modify the legacy u-boot to make it right Link to comment Share on other sites More sharing options...
hexdump Posted October 19, 2020 Share Posted October 19, 2020 i do not know any details, i just know that is why the u-boot.ext was there ... maybe just give a mainline c4 u-boot a try and chainload that? i would not recommend to touch the legacy u-boot on the box as long as you do not know 100% what you are doing (maybe you do know 100%) as its very easy to brick a box this way due to wrong memory timings best wishes - hexdump Link to comment Share on other sites More sharing options...
Devmfc Posted October 20, 2020 Share Posted October 20, 2020 (edited) Maybe these helps as a start: https://gitlab.com/baylibre/amlogic/atv/u-boot/-/wikis/home https://u-boot.readthedocs.io/en/latest/board/amlogic/sei610.html But it looks like the u-boot.ext Balbes uses is one without de binaries from Amlogic, since he is chaining his bootloader after the boards own u-boot, so memory initialization and soc initialization is already done. Edited October 20, 2020 by Devmfc Link to comment Share on other sites More sharing options...
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