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| 12:22.22 | oliv3r | lkcl: a few days have passed; so i'll try to ask the question again :) |
| 12:22.49 | oliv3r | lkcl: in u-boot currently we have MMC=3 set in boards.cfg; but as far as I know, this is not valid, the BROM cannot boot from MMC3, only MMC2 and thus this statement won't work |
| 12:23.15 | oliv3r | it WILL work, IF you manage to store the SPL elsewhere (nand, SPI, mmc0) which loads whatever is on mmc3, but that's really not what you'd want |
| 12:23.36 | oliv3r | I think MMC=2 should be in boards.cfg which yes, means you can only board from mmc2 with those pins actually connected |
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| 17:23.39 | lkcl | oliv3r: yep if you're asking "should that be changed" please go ahead. |
| 17:24.11 | lkcl | oliv3r: there will only be one user boot method: NAND. |
| 17:26.55 | lkcl | oliv3r: so now that i think about it, it really doesn't matter. the SPL will only be on NAND. when doing factory-install that is a completely different matter, and booting will only be done from "stock" anyway. |
| 17:27.01 | lkcl | probably USB-FEX |
| 17:27.14 | lkcl | but maybe mm32. |
| 17:27.38 | lkcl | s/mm32/mmc2/ |
| 17:28.34 | lkcl | however, once loaded from NAND, yes booting should be possible from SDcard, which is MMC *3*. |
| 17:29.02 | lkcl | which is the micro-sd card slot on the front. |
| 17:29.33 | lkcl | so if you are asking "should u-boot try to load the linux kernel from the 68-pin header mmc2" the answer is ABSOLUTELY NOT. |
| 17:30.08 | lkcl | if you're asking "should u-boot try to load the linux kernel from mmc3 by default" the answer is YES |
| 17:30.51 | lkcl | if you're asking "should u-boot/spl try to load from the 68-pin header mmc2" the answer is ABSOLUTELY NOT. |
| 17:31.25 | lkcl | if you're asking "should u-boot/spl try to load script.fex and u-boot from the front micro-sd card slot (mmc3)" the answer is YES. |
| 17:31.50 | lkcl | in short, MMC=3 is correct. |
| 17:31.58 | lkcl | that's my understanding, anyway. |
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| 19:24.45 | oliv3r | lkcl: i think the mmc= option applies to the SPL only though |
| 19:26.37 | oliv3r | so shall the SPL try to load u-boot from MMC= |
| 19:26.48 | oliv3r | since u-boot can boot from whatever I thought |
| 19:27.06 | oliv3r | anyway, just gotta make sure that we dot the i's and cross the t's here |
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| 20:42.03 | lkcl | oliv3r: SPL should be attempting to load from MMC=3 because that would mean that anyone putting a boot-compatible MicroSD card into the front slot stands a chance of it working |
| 20:42.13 | lkcl | if SPL has been loaded onto the NAND |
| 20:42.29 | lkcl | ... or uploaded to DDR3 RAM using felboot |
| 20:42.37 | lkcl | that's the most useful thing. |
| 20:43.37 | lkcl | for "factory" use it would... i know what: if you'd be happy to add an extra line to the u-boot boards.cfg ... say.... i dunno... EOMA68-A20-FACTORYSPL or something, _that_ should have MMC=2 |
| 20:44.08 | lkcl | because only at the factory would we make a special engineering board to boot off of the 2nd MMC. |
| 20:44.14 | lkcl | but, to be honest, that's not needed |
| 20:44.38 | lkcl | becauuuuse, if you boot off of MMC2 (from the 68 pins) we would make it a boot0/boot1 system *anyway*. |
| 20:44.45 | lkcl | so yeah don't worry about it. |
| 20:44.53 | lkcl | MMC=3 is absolutely fine. |
| 20:45.26 | lkcl | btw does anyone know how to put SD/MMC on the A20 into "SPI compatibility" mode? or is it automatic? |
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| 20:53.32 | oliv3r | lkcl: you can't upload to ddr via fel; only to sram :) |
| 20:53.54 | oliv3r | lkcl: it really really sucks they messed up the mmc connector on the board :( |
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| 21:10.22 | lkcl | oliv3r: ok ok sram, that's fiiine :) |
| 21:11.12 | lkcl | oliv3r: *sigh* it's to do with the orientation of the CPU. wits-tech turned it through 180 degrees without consulting me, which is why the ethernet PHY is in a truly arse-about-face corner. |
| 21:11.38 | lkcl | they did a really _really_ beautiful and i truly mean that job on the DDR3 RAM wiring |
| 21:12.08 | lkcl | _but_ because they also only did 3 signal layers, there simply wasn't enough room to cross over MMC0 to the other side of the board |
| 21:12.46 | lkcl | so... _again_ without consulting me they dropped MMC0, put MMC3 through to the MicroSD slot and put MMC2 onto the EOMA68 header |
| 21:13.07 | oliv3r | really shit |
| 21:13.12 | lkcl | and then proceeded to fuck everything up by adding in MMC pull-up resistors onto the EOMA68 GPIO lines |
| 21:13.13 | oliv3r | will it ever get 'fixed' in a v2 so to say? |
| 21:13.15 | oliv3r | (new soc) |
| 21:13.21 | lkcl | etc. etc. |
| 21:13.51 | lkcl | we'll really need to do a new revision, use those lower-cost x16 DDR3 RAM ICs that tom uses on the cubieboards |
| 21:14.01 | lkcl | lower-cost _and_ smaller, give us a bit more space |
| 21:14.06 | oliv3r | very cool |
| 21:14.07 | lkcl | and upgrade to 2gbyte |
| 21:14.13 | lkcl | and use a GbE PHY |
| 21:14.41 | lkcl | but the SD/MMC? weeelll, to be honest, after i got over freaking out and jumping up and down, i think it really works. |
| 21:14.42 | oliv3r | yeah sounds sweet :) |
| 21:14.52 | lkcl | but we have to sell these cards first! |
| 21:14.53 | oliv3r | well if they re-do the board |
| 21:14.56 | oliv3r | make sure they do it proper ;) |
| 21:15.23 | lkcl | *grins* yeahhh.... it'll be another $12k though. we need to sell boards first. |
| 21:15.41 | lkcl | either that or i need to learn how to do DDR3 RAM routing. |
| 21:15.51 | oliv3r | heh |
| 21:15.58 | oliv3r | ddr ram routing is a bitch :( |
| 21:16.07 | lkcl | shudders |
| 21:16.11 | lkcl | it's fiiiine! |
| 21:17.27 | lkcl | btw when i spoke to allwinner's tech director several months back i mentioned several things, including that we _really_ want to see a 28nm quad-core version of the A20. |
| 21:18.13 | lkcl | he mentioned that he was concerned about MALI 400 overloading the main CPU: ARM's MALI driver really is pretty shit. |
| 21:18.46 | lkcl | i reassured him about libv's work, that there are performance increases possible and that it's really a software issue |
| 21:19.09 | oliv3r | a23 si pretty cool actually |
| 21:19.30 | lkcl | and also suggested they look at both vivante and tegra. he was _really_ intrigued to hear that tegra are licensing their GPU stuff |
| 21:19.36 | lkcl | oliv3r: what's an A23? :) |
| 21:20.15 | lkcl | *sigh* just looked it up... |
| 21:20.49 | oliv3r | 552 mhz ram |
| 21:20.52 | oliv3r | in a OEM tablet |
| 21:20.58 | oliv3r | 1.4ghz cpu |
| 21:21.09 | oliv3r | and there might be a quad version |
| 21:21.40 | lkcl | gooood. |
| 21:21.50 | oliv3r | but you may know more then we |
| 21:21.53 | oliv3r | we only got a23 SDK |
| 21:21.57 | oliv3r | and a tablet 'in the wild' |
| 21:22.04 | oliv3r | but no sata, no hdmi etc |
| 21:22.05 | oliv3r | tablet soc :( |
| 21:22.14 | lkcl | my associate will be calling eva in the morning. |
| 21:22.43 | lkcl | if they've done the same thing that they did with the A10/A10s, they *might* have just used the same die but not brought out some of the pins. |
| 21:22.50 | lkcl | i gotta make a phone call .... :) |
| 21:22.51 | oliv3r | i invited eva to fosdem |
| 21:22.54 | oliv3r | haven't heard anything |
| 21:22.55 | lkcl | the call's in the morning |
| 21:22.57 | lkcl | oh right! |
| 21:23.07 | lkcl | hey that would be cool. |
| 21:23.30 | oliv3r | so double invite her :) |
| 21:23.33 | lkcl | oliv3r: i have to make a phone call so i can catch my associate for his call tomorrow morning ok? |
| 21:23.36 | lkcl | gotta go |
| 21:43.28 | lkcl | oliv3r: ok, thank you (a lot!) - my associate's going to ask about the A23, quad-core versions etc. tomorrow |
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| 21:47.05 | oliv3r | very cool |
| 21:47.08 | oliv3r | and invite eva to fosdem :) |
| 21:47.18 | oliv3r | but no sata/hdmi is sad :( |
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