OSDev.org

The Place to Start for Operating System Developers
It is currently Thu Mar 28, 2024 8:34 am

All times are UTC - 6 hours




Post new topic Reply to topic  [ 31 posts ]  Go to page Previous  1, 2, 3
Author Message
 Post subject: Re: VESA Tutorial
PostPosted: Sun Oct 08, 2017 8:16 am 
Offline
Member
Member
User avatar

Joined: Fri Feb 17, 2017 4:01 pm
Posts: 640
Location: Ukraine, Bachmut
generally yes, they are documented and pins, registers are accessible. there might be even "programming guidelines/notes" helping you to get the idea what to do with all that thing. xD if you are lucky. i2c/smbus controllers are documented as well. if the programming manual isn't crappy, then it's possible. it happens that the vendor throws some joke looking piece that it calls "manual", then you have to research their BSP code in addition, they all use linux/uboot, so they are obligated to publish it. it's a good idea to look at the documentation quality for the SoC in question before, rather than hastily buying the board just because it's so cute and numbers are so intriguing. like for example in the case of mentioned EsspressoBin board that is as good as Marvel is bad in providing needed resources. :)

on the example of setting the DDRC/DDR PHY, which i've done, the documentation was desperately insufficient, basically i learnt from uboot sources, and they in turn, got it from BSP code. but ddr is a special thing often made that "secret". for example MSC controllers (that deal with eMMC/SD/SDIO, the current task) are much better described. lcd stuff looks the same - loads of tables, register definitions, diagrams etc.

in short here the problem is not the same as with proprietary GPUs, rather the manual quality.

_________________
ANT - NT-like OS for x64 and arm64.
efify - UEFI for a couple of boards (mips and arm). suspended due to lost of all the target park boards (russians destroyed our town).


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 31 posts ]  Go to page Previous  1, 2, 3

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 27 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group