From: Stephen Warren <swarren@wwwdotorg.org>
To: Andrew Baumann <Andrew.Baumann@microsoft.com>
Cc: Peter Maydell <peter.maydell@linaro.org>,
"qemu-arm@nongnu.org" <qemu-arm@nongnu.org>
Subject: Re: [Qemu-arm] [PATCH] bcm2835_property: implement "get board revision" query
Date: Mon, 8 Feb 2016 21:28:07 -0700 [thread overview]
Message-ID: <56B96AD7.1040002@wwwdotorg.org> (raw)
In-Reply-To: <BLUPR0301MB20343F80372F1202A8EF2D3A9ED40@BLUPR0301MB2034.namprd03.prod.outlook.com>
On 02/07/2016 03:37 PM, Andrew Baumann wrote:
> Hi Stephen,
>
> Thanks for the patch!
>
>> From: Stephen Warren [mailto:swarren@wwwdotorg.org]
>> Sent: Sunday, 7 February 2016 4:09 PM
>>
>> Return a valid value from the BCM2835 property mailbox query "get board
>> revision". This query is used by U-Boot. Implementing it fixes the first
>> obvious difference between qemu and real HW.
...
> * Do you know where we can find the appropriate values for Pi1 boards?
Sure. There are two encoding schemes. For most boards, the revision
number is a simple integer that indicates the board type. A list can be
found at:
> https://github.com/AndrewFromMelbourne/raspberry_pi_revision/blob/master/README.md#prior-to-raspberry-pi-2
(There's also a bit that indicates the Pi has been over-volted in there,
so you need to mask off 0x1000000 or just use the LS byte when
extracting the revision.)
The RPi2 and RPi0 introduce a more complex multi-field encoding scheme
described at:
> https://github.com/AndrewFromMelbourne/raspberry_pi_revision/blob/master/README.md#raspberry-pi-2--model-zero
You can find how U-Boot interprets the revision fields at:
> https://github.com/swarren/u-boot/blob/rpi_dev/board/raspberrypi/rpi/rpi.c#L335
Also see the various xx_models[] arrays, and some more links at:
> https://github.com/swarren/u-boot/blob/rpi_dev/board/raspberrypi/rpi/rpi.c#L77
prev parent reply other threads:[~2016-02-09 4:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-07 5:09 [Qemu-arm] [PATCH] bcm2835_property: implement "get board revision" query Stephen Warren
2016-02-07 12:48 ` Peter Maydell
2016-02-07 12:48 ` [Qemu-devel] " Peter Maydell
2016-02-07 22:37 ` [Qemu-arm] " Andrew Baumann
2016-02-09 4:28 ` Stephen Warren [this message]
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