netdev - Re: [PATCH RFC] net: phy: add state PERM

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Message-ID: <9fadc274-fb74-7ab9-8acf-53e3a49a48c9@gmail.com>
Date:   Mon, 10 Jun 2019 14:44:33 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH RFC] net: phy: add state PERM_FAIL

On 6/10/19 2:27 PM, Andrew Lunn wrote:
>> Maybe the broader question is how do you, Heiner and Russell imagine a
>> genuine case where the PHY does not have a firmware provided/loaded
>> before Linux does take over (say, BoM cost savings dictate no flash can
>> be used
> 
> I've not seen either of these PHY devices not have a FLASH. I also
> wonder how long such a download to RAM takes. I suspect it is
> slow. The boards i have, have a 4Mbit Flash, so, 256K 16bit words.
> How long does 256K MDIO transfers take, given that they are typically
> polled IO? Is that a reasonable design/cost trade off?

If you have a long enough uptime, sure. You could emulate the SPI flash
through the means of GPIO pins, it's embedded, so sky's (no pun
intended) is the limit :).
-- 
Florian