On 14/01/17 20:03, [email protected] wrote: > On Sat, Jan 14, 2017 at 2:53 PM, André Przywara <[email protected]> > wrote: >> On 14/01/17 16:20, [email protected] wrote: >>> The Allwinner kernel referenced in this thread has source for working >>> DDR eMMC mode on the A64. >>> >>> http://forum.banana-pi.org/t/bpi-m64-android-6-0-1-source-code/2748 >>> >>> DDR eMMC support is needed to get the newer eMMC chip used on the BPI >>> M64 board working. >>> >>> Of course this info will need to be extracted and applied to mainlining >>> efforts. >> >> That works already for weeks, the MMC patches are on their way into the >> mainline kernel: >> http://lists.infradead.org/pipermail/linux-arm-kernel/2017-January/478107.html > > I see a DTD change for DDR MMC support on the list. Is that enough to > achieve the shift into DDR mode for the eMMC chip? I thought we were > missing needed bits of code for the MMC driver.
The existing driver already supported DDR52 mode. Maxime enabled support for HS200 and AFAIK is working towards HS400. Please note that the BPi-M64 has an eMMC chip supporting only 100MB/s on the read side and even that's the datasheet maximum value, I suppose. Writing is limited to a whopping 6MB/s anyway. So even DDR52 mode would be good enough for this board. Cheers, Andre. -- 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.
