On 05/26/2016 01:46 PM, Paul Burton wrote:
On Thu, May 26, 2016 at 12:21:23AM +0200, Marek Vasut wrote:
Not for SPL, which has 14 kiB size limit and it is itching to overflow. I am literally counting bytes in the SPL and removing slop from structures to make it fit, just barely. With the USB loader, I can brutalize the SPL into having extremely rudimentary UART support now (like printch() being the most advanced output mechanism, but you can only use it three times, otherwise the code won't fit and the board is eaten by demons) and this is where this patch comes into play.
So yes, for full u-boot, this _should_ be part of DT. For SPL, please apply.
Hi Marek,
Hi!
Interesting :) May I ask which platform/SoC you're working with? Have you seen the (unfortunately currently out of tree) port we did for the JZ4780-based Ci20? I recall the pain of squeezing SPL down to a small enough size well...
I bought the CI20, yeah. I started with that tree and am now getting it into mainline shape. I actually managed to optimize the SPL, so it does not overflow. One of the things which helped a lot was removing slop[1] from the structures and using appropriate data types in them (like don't use u32 to store an 8bit number). I also tinified the MMC stack, so that it won't pull in too much useless code.
At this point, I have a u-boot running from SD card and the SD driver in full U-Boot is already probing from DT and using DM. I sent Daniel the updated patches, but they are still work in progress. Nonetheless, if you want me forward that to you as well, let me know.
I plan to get this CI20 submitted at some point this or next week, so it can land in 2016.07 (I hope!) and then debian and fedora-mips (and other distros) can pick it up and package proper. That's how I see it.
btw. what is the linux support status of the ci20 ? Is anyone working on that? I saw the DTS in Linux, but it's pretty bare-bones.
btw2. can I get the ci40 anywhere or is that just unobtainium board ?
https://github.com/MIPS/CI20_u-boot
Thanks, Paul
[1] http://www.catb.org/esr/structure-packing/