linux-kernel - Re: [RFC PATCH 2/3] RISC-V: Initial DTS for Microchip ICICLE board

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Message-ID: <fe079b4a-5410-5cc8-3f5e-8a95b573078a@codethink.co.uk>
Date:   Tue, 3 Nov 2020 18:28:11 +0000
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Cyril.Jean@...rochip.com, atishp@...shpatra.org
Cc:     devicetree@...r.kernel.org, aou@...s.berkeley.edu,
        Daire.McNamara@...rochip.com, anup.patel@....com,
        linux-kernel@...r.kernel.org, atish.patra@....com,
        robh+dt@...nel.org, alistair.francis@....com,
        paul.walmsley@...ive.com, palmer@...belt.com,
        linux-riscv@...ts.infradead.org, Padmarao.Begari@...rochip.com
Subject: Re: [RFC PATCH 2/3] RISC-V: Initial DTS for Microchip ICICLE board

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.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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