Am 20.09.2018 um 15:57 schrieb Michael Mrozek EvilDragon@openpandora.org:
Am Donnerstag, den 20.09.2018, 15:45 +0200 schrieb H. Nikolaus Schaller:
Hi,
Or: Can we change some EMIF values to raise stability (maybe at the cost of tiny bit performance?
As far as I remember, Tony did send some EMIF setup patch that is in notaz and letux uboot now, but noted that it might be reasonable to change some more parameters. Unfortunately I do not really understand more about them than you... So I have never played with them.
I thought EMIF is in the MLO, not in U-boot...? Or is the MLO combined with U-Boot on the Pyra?
Yes. There is just a single u-boot source and two compile phases make
MLO (called "SPL") u-boot.img
out of it. Up to ca. 5 years ago there was a separate x-loader source tree for MLO.
I'm confused :)
Well, I'm perfectly fine doing trial and error with the values.
They are in a big array of magic hex numbers...
http://git.goldelico.com/?p=letux-uboot.git;a=blob;f=board/goldelico/letux-c...
The datasheet usually has minimum and maximum listed, so I should be able to safely change them.
I'd change one value at a time between max and min to see if it improves things (or worsens them).
Also, simply comparing the values to the datasheet might help as well.
-- Greetings,
Michael Mrozek
OpenPandora GmbH CEO: Michael Mrozek
Schäffbräustr. 11 85049 Ingolstadt Germany Tel.: +49 841 990 5548 http://www.openpandora.de/ HRB 4879, Amtsgericht Ingolstadt
eMail: mrozek@openpandora.org