achingupta
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BCM2837 datasheet?

Mon Feb 29, 2016 1:12 pm

I intend to start some bare metal development on the RPI3. Where can I find some information about the boot sequence and the memory map/data sheet of BCM2837? Are these aspects of the chipset the same as on RPI2?

jamesh
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Re: BCM2837 datasheet?

Mon Feb 29, 2016 2:29 pm

achingupta wrote:I intend to start some bare metal development on the RPI3. Where can I find some information about the boot sequence and the memory map/data sheet of BCM2837? Are these aspects of the chipset the same as on RPI2?
Boot sequence is the same, there's a config option to force 64bit mode, Dom mentioned it elsewhere on the forum. But I don't believe there is a datasheet yet, although the majority will be the same as previous models.
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Re: BCM2837 datasheet?

Mon Feb 29, 2016 9:20 pm

While we've got your attention... Is the 2837 made on a 40nm process node, or has Broadcom started using 28nm?

bullen
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Re: BCM2837 datasheet?

Thu Mar 03, 2016 10:29 pm

I wonder this too, seems they are still on 40 nm if you google = heat problems.

Really the bus and memory needed upgrading more than the CPU = new platform.
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Re: BCM2837 datasheet?

Sun Apr 17, 2016 7:41 am

Yeah, where is the datasheet?
(I have it for the old BCM2835)
Any news/updates on this?

jamesh
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Re: BCM2837 datasheet?

Sun Apr 17, 2016 8:32 pm

It's 40nm, the cost implications of going to anything smaller are....quite large!

Reduced schematics have been released, datasheet is pretty much the same as earlier ones.
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Re: BCM2837 datasheet?

Tue Apr 19, 2016 1:04 pm

jamesh wrote:Reduced schematics have been released, datasheet is pretty much the same as earlier ones.
Ok, where can we find the schematics? (Schematics of what? The RP3 or the chip? And what does it mean "reduced"?)
It is the "pretty much" part that need to be clarified? System bus is 64 bit so what else has changed internally?
How does it affect clock frequency and GPIO ports etc?

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Re: BCM2837 datasheet?

Tue Apr 19, 2016 1:15 pm

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Re: BCM2837 datasheet?

Tue Apr 19, 2016 8:25 pm

Thank you ghans!

Can you also show:
1) where the AUD_PWM0 and AUD_PWM1 signals come from (on the schematic)?
2) anything regarding the (chip) internal wiring of the PWMs? (if they have changed in the new chip)

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