On Tue, Nov 3, 2020 at 10:28 AM Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx> wrote: > > On 03/11/2020 18:10, Cyril.Jean@xxxxxxxxxxxxx wrote: > > On 11/3/20 3:07 PM, Atish Patra wrote: > >> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > >> > >> On Fri, Oct 30, 2020 at 2:20 PM Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx> wrote: > > ,snip[ > > >>>> @Cyril : Can we enable both eMMC & sdcard at the same time ? > >>> I would put /both/ in but only enable the one in use for the moment. > >>> Our boards are booting of eMMC as supplied, so this isn't going to work > >>> as well. The eMMC is 8bit wide, and thus is only delivering 11MB/sec > >>> instead of 22MB/sec. This performance is still not great, but losing > >>> half the data-rate is just not good. > >>> > >> I am not sure what should be enabled by default. Updating sdcard is much > >> easier than eMMC card and we use that approach. > >> > >> @Cyril: Is there a way that we can enable both ? > >> > > Yes, we can enable both but this requires a modification to the FPGA > > design. One of the guys prototyped this while I was away. We will move > > this along. This will require reprogramming the FPGA with a new design > > and HSS version. > > > > Regards, > > > > Cyril. > > I either missed or couldn't find a way of forcing the boot mode to be > from the SD slot. Have I missed something? At the moment we'd like to > have more storage available as the ~7G free on the eMMC is not enough. > I use tftpboot to load the kernel & DT from the network. SD card is enabled in this DT and Linux kernel uses SD slot instead of eMMC. To summarize, eMMC is used for HSS & U-Boot while SD card is used for Linux which makes more storage available to Linux. IMO, we should enable the sdcard for Linux DT until updated FPGA design & HSS is available. > -- > Ben Dooks http://www.codethink.co.uk/ > Senior Engineer Codethink - Providing Genius > > https://www.codethink.co.uk/privacy.html -- Regards, Atish
