linux-kernel - Re: [PATCH 0/8] firmware: arm_scpi: add support for legacy SCPI protocol

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Message-ID: <CAD0U-hK982V+kUArjVSG7pTs5CLpNsgJaC5t8aPg8XuoiMRU0A@mail.gmail.com>
Date:   Mon, 21 Nov 2016 15:04:39 +0000
From:   Ryan Harkin <ryan.harkin@...aro.org>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Philippe Robin <Philippe.Robin@....com>,
        devicetree@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Olof Johansson <olof@...om.net>,
        linux-amlogic@...ts.infradead.org,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/8] firmware: arm_scpi: add support for legacy SCPI protocol

On 8 November 2016 at 17:46, Russell King - ARM Linux
<linux@...linux.org.uk> wrote:
> On Tue, Nov 08, 2016 at 05:37:25PM +0000, Sudeep Holla wrote:
>>
>>
>> On 08/11/16 16:06, Russell King - ARM Linux wrote:
>> >On Tue, Nov 08, 2016 at 03:40:38PM +0000, Russell King - ARM Linux wrote:
>> >>As it contains a zero sized Image and .dtb files, I tried copying my
>> >>Image and .dtb over, and also copied my original config.txt (only
>> >>change is AUTORUN: FALSE).  It still doesn't appear to boot beyond
>> >>this point.
>> >
>> >Well, it seems that I can't even go back to my original set of firmware
>> >as UEFI has stopped working:
>> >
>> >NOTICE:  Booting Trusted Firmware
>> >NOTICE:  BL1: v1.0(release):14b6608
>> >NOTICE:  BL1: Built : 14:15:51, Sep  1 2014
>> >NOTICE:  BL1: Booting BL2
>> >NOTICE:  BL2: v1.0(release):14b6608
>> >NOTICE:  BL2: Built : 14:15:51, Sep  1 2014
>> >NOTICE:  BL1: Booting BL3-1
>> >NOTICE:  BL3-1: v1.0(release):14b6608
>> >NOTICE:  BL3-1: Built : 14:15:53, Sep  1 2014
>> >UEFI firmware (version v2.1 built at 14:41:56 on Oct 23 2014)
>> >Warning: Fail to load FDT file 'juno.dtb'.
>> >
>>
>> This again because of incompatibility of the configuration data saved in
>> NOR flash. The erase command I gave early is to erase that when you
>> switched between the UEFI binaries. It's really horrible mess UEFI
>> created in the initial days of Juno, and hopefully they have moved to
>> some standard format these days.
>
> Yea, what it means is I've no possibility to go back to what was
> originally working now, since I don't understand how to get UEFI to
> behave (Will set the machine up for me, I don't have any information
> on how it was originally configured other than what was on the uSD
> card, which appears incomplete.)
>
>> >and UEFI is the most unfriendly thing going - the "boot manager" thing
>> >doesn't let you view the configuration:
>> >
>>
>> I completely agree. I had real bad times in past dealing with such
>> things in UEFI.
>>
>> >[1] Linux from NOR Flash
>> >[2] Shell
>> >[3] Boot Manager
>> >Start: 3
>> >[1] Add Boot Device Entry
>> >[2] Update Boot Device Entry
>> >[3] Remove Boot Device Entry
>> >[4] Reorder Boot Device Entries
>> >[5] Update FDT path
>> >[6] Set Boot Timeout
>> >[7] Return to main menu
>> >Choice:
>> >
>> >and dropping into the shell... well, I've no idea how to get a listing
>> >of what it thinks is in the NOR device (or even how to refer to the
>> >NOR device.)  "devices" shows nothing that's even remotely English.
>> >

Using UEFI is painful enough on Juno.  Using a 2 year old version with
"that" menu system is even worse.

So I'll just pitch in here and recommend you switch to using u-boot.
Then you can see your config with "printenv" and you'll probably
understand it too.

The board will boot my prebuilt kernel/DTB using u-boot if you erase
the uSD card and unzip this firmware image to it:

http://releases.linaro.org/members/arm/platforms/16.10/juno-latest-oe-uboot.zip

Then you can copy over your own kernel & DTB for your own testing,
configure u-boot for TFTP, or whatever you like.

Switching to u-boot won't solve any thermal sensor calibration problems.


>>
>> I think startup.nsh needs some edits. Just replace it with something like:
>>
>> "norkern dtb=board.dtb console=ttyAMA0,115200n8 root=/dev/nfs rw
>> rootwait ip=dhcp systemd.log_target=null nfsroot=..." or something
>> alike. Currently it just echos and stops.
>>
>> Regarding the new firmware stopping abruptly, I have no clue, except
>> asking you to erase the flash completely when switching between the
>> firmware versions. That has worked for me for all UEFI related issues in
>> the past. It's really annoying I understand.
>>
>> flash> eraseall
>
> I've tried that, it still stops at the same point, after:
>
> FV2 Hob           0xFE07B000 - 0xFE8253BF
>
> and remains unresponsive.
>
> I do notice that the uSD card becomes visible through USB at this point
> though.
>
> Okay, well, I'm going to have to disable Juno from the nightly boots
> until we get some kind of resolution on this, as my Juno is now
> incapable of booting anything.
>
> --
> RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
> according to speedtest.net.