From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans de Goede Date: Tue, 23 Dec 2014 11:03:50 +0100 Subject: [U-Boot] L2 cache and LCD on sunxi In-Reply-To: References: <54984A91.1040708@redhat.com> Message-ID: <54993E06.802@redhat.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi, On 23-12-14 05:36, Simon Glass wrote: > Hi Hans, > > On 22 December 2014 at 09:45, Hans de Goede wrote: >> Hi, >> >> On 21-12-14 19:52, Simon Glass wrote: >>> >>> Hi, >>> >>> I ran up a banana PI and noticed that HDMI works in U-Boot. Great! >>> >>> Scrolling seems very slow though - is the L2 cache disabled perhaps? >> >> >> I don't think so, but it could be, I think the scrolling code is just >> very inefficient. Feel free to poke things a bit around this, ARM >> cache management is not my forte. > > I think it need ssomething like the code in exynos/soc.c - see > v7_outer_cache_enable(). > > Even with the 7 inch it's very slow. Ok, I'll put looking into this on my TODO list, if someone who is more knowledge beats me to it I won't complain :) >>> Also are there instructions for getting an LCD running in U-Boot? I >>> have an Olimex A20-OLinuxion-MICRO (what a mouthful!) with a 7 inch >>> display if that matters. I can't find any useful information so far. >> >> >> He he, your in luck I've been working on LCD support the last few days, >> and I just got the olimex 7" lcd running on olimex boards :) >> >> If you use my current wip tree: >> >> https://github.com/jwrdegoede/u-boot-sunxi/tree/sunxi-wip >> >> And build for the A20-OLinuXino_MICRO-lcd7_defconfig things should >> just work, assuming you are using the standard olimex 7" lcd with >> a standard 40 pins pata cable. >> >> Note in order for the kernel to take over the fb you need a small >> kernel patch on top of 3.19, I've attached the patch. > > That's great, yes it works! > > Looking at the patches, rather than adding new board configs and > CONFIGs I think it should be device-tree-controlled. Maybe an > environment variable could hold the display type? I agree that ultimately this should all move to devicetree as mentioned in this commit message: https://github.com/jwrdegoede/u-boot-sunxi/commit/4182ed0c8d037a357161dda63e179340e08adb7e :) As for using an environment variable, there is already video-mode env. var support, see doc/README.video in my tree. I've considered also adding things like the LCD timings to the environment but they really belong in a devicetree overlay, and if I add support for them to the environment now I need to keep supporting that in the future. So the plan is to use Kconfig for now, and move over to dt in the future. Regards, Hans