On Thu, Apr 21, 2016 at 6:01 PM, Siarhei Siamashka <[email protected]> wrote: > On Thu, 21 Apr 2016 16:14:13 -0400 > "[email protected]" <[email protected]> wrote: > >> On Thu, Apr 21, 2016 at 4:09 PM, Siarhei Siamashka >> <[email protected]> wrote: >> > On Thu, 21 Apr 2016 13:38:19 -0400 >> > "[email protected]" <[email protected]> wrote: >> > >> >> On Thu, Apr 21, 2016 at 1:17 PM, Siarhei Siamashka >> >> <[email protected]> wrote: >> >> > Hello, >> >> > >> >> > On Thu, 21 Apr 2016 11:24:56 -0400 >> >> > "[email protected]" <[email protected]> wrote: >> >> > >> >> >> The manual is very sparse on this subject. Does anyone know what order >> >> >> it looks at the MMC options? >> >> >> >> >> >> For example - MMC flash and an SD Card socket. For brick recovery it >> >> >> should be possible to put in an SD Card with a proper boot sector >> >> >> (right signature) and then boot from the SD Card overriding the MMC >> >> >> flash. >> >> >> >> Thanks for info. >> >> >> >> > >> >> > We don't have full details yet, but it looks like the boot order >> >> > on Allwinner A64 is somewhat similar to >> >> > https://linux-sunxi.org/Boot#A31 >> >> > >> >> > For example, the Jide Remix Mini device boots from the internal >> >> > eMMC by default, but the user can override the boot order by >> >> > pressing the FEL button: >> >> > https://linux-sunxi.org/Jide_Remix_Mini#FEL_mode >> >> > >> >> > And if I understand it correctly, most of the Allwinner based devices >> >> > (at least the ones which do not deviate from the reference schematics) >> >> > are perfectly unbrickable: >> >> > >> >> > http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/380686.html >> >> > >> >> > When somebody gets an A64 tablet, I strongly suspect that one of the >> >> > volume control buttons is going to be connected to the FEL pin too. >> >> > But we can't be 100% sure until somebody confirms this. >> >> > >> >> > Why are you asking this question? >> >> >> >> We are designing A64 board for an embedded system. >> >> >> >> I don't see any boot A64 jumpers for picking one of the four modes -- >> >> sel[0:1] >> > >> > You are right. There are no UBOOT_SEL pins in the A64 datasheet. This >> > probably means that there is some hardcoded boot order in the case if >> > the FEL button is not pressed. But we haven't seen anything other than >> > the SD card and the eMMC as a bootable media yet >> > >> > BTW, did you reply off-list on purpose? >> >> no, i just must have touched wrong reply key > > OK, adding the linux-sunxi mailing list back to CC :-) > > I have also tried to experiment a bit and added the actual A64 boot > sequence information to the wiki: > > https://linux-sunxi.org/BROM#A64 > > As for designing an A64 board, unless you really want a 64-bit > processor, something like Allwinner H3 might be a better choice > right now. At least it is currently better supported in software > and has more USB ports. ARM Cortex-A53 is faster than ARM Cortex-A7 > per MHz, but it is also more power hungry. > > Do you have any contacts at Allwinner? Probably not, because otherwise > you would not be asking the A64 boot sequence questions here.
We require Android 5.1, not an option on H3. > > -- > Best regards, > Siarhei Siamashka -- Jon Smirl [email protected] -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
