On 04/02/2017 06:17 PM, Luke Kenneth Casson Leighton wrote: > On Sun, Apr 2, 2017 at 10:51 PM, zap <[email protected]> wrote: >> I am really though glad you take this sort of thing seriously. We should >> all thank you for such zeal towards keeping things "Libre" > mmm... zeal's a dirty word, now :) My bad...
>> I hope you are successful Luke. And really, if normand sees this post, I >> hope he has a better understanding of the consequences of such actions. > let's hope so >> Anyways though, I look forward to when you get the rockchip processor >> working to your specifications. > i'll be happy it works _at all_! I am sure you will figure it out sooner or later. >> One last thing though, you said the a20 doesn't support 4.9 kernel... > correction: it does... but not with 100% hardware functionality > supported (which is no good for what i promised and demonstrated in > the updates) > >> but what about the rk3288 processor? > mainline for everything. u-boot, kernel - everything. it's been > that way for some considerable time. > > i'm still struggling with reverse-engineering the proprietary DDR3 > 200mhz initialisation binary, working out what the discrepancies are > between that and u-boot. it doesn't help that i don't know if i > soldered the processor on incorrectly or any one of the four 96-pin > DDR3 RAM ICs... > > i've bought a stack of cheaper RAM ICs with which to experiment: > they're the same ones as on the RK3288-Firefly so in theory i should > be able to use exactly the same dtb file for the dram settings... > except the damn impedance is only (appx) 50 ohms not 100 like it is > for a 6-layer 1.6mm PCB... > > basically there's too many unknowns in order to triangulate exactly > where the problem might be when any one of them could be the source of > the failure. > at some point i'm just going to say "fuck it", work out how to load > the proprietary DRAM initialisation, then u-boot with DRAM > initialisation *disabled*, work out how to get the RK3288 *out* of > DRAM initialisation mode and to continue running u-boot. I am hopeful you will succeed in reverse enginnering the rk3288. > apparently the internal ROM USB-loader can be asked to "shift" > whatever's loaded down into a different address in memory, but how > it's then executed i don't know. > > l. > > _______________________________________________ > arm-netbook mailing list [email protected] > http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook > Send large attachments to [email protected] _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
