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Re: [Qemu-arm] [PATCH] bcm2835_property: implement "get board revision"

From: Stephen Warren
Subject: Re: [Qemu-arm] [PATCH] bcm2835_property: implement "get board revision" query
Date: Mon, 8 Feb 2016 21:28:07 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

On 02/07/2016 03:37 PM, Andrew Baumann wrote:
> Hi Stephen,
> Thanks for the patch!
>> From: Stephen Warren [mailto:address@hidden
>> 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

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