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Date: Tue, 3 Nov 2020 10:36:43 -0800 From: Atish Patra <atishp@...shpatra.org> To: Ben Dooks <ben.dooks@...ethink.co.uk> Cc: Cyril.Jean@...rochip.com, devicetree@...r.kernel.org, Albert Ou <aou@...s.berkeley.edu>, Daire McNamara <Daire.McNamara@...rochip.com>, Anup Patel <anup.patel@....com>, "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>, Atish Patra <atish.patra@....com>, Rob Herring <robh+dt@...nel.org>, Alistair Francis <alistair.francis@....com>, Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, linux-riscv <linux-riscv@...ts.infradead.org>, Padmarao Begari <Padmarao.Begari@...rochip.com> Subject: Re: [RFC PATCH 2/3] RISC-V: Initial DTS for Microchip ICICLE board On Tue, Nov 3, 2020 at 10:28 AM Ben Dooks <ben.dooks@...ethink.co.uk> wrote: > > On 03/11/2020 18:10, Cyril.Jean@...rochip.com 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@...ethink.co.uk> 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
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