On 10/1/2020 2:18 PM, Linus Walleij wrote:

On Thu, Oct 1, 2020 at 9:19 PM Florian Fainelli [off-list ref] wrote:

quoted

The physical memory map looks like this:

0..3GB -> DRAM
3GB..4GB -> Registers, Boot ROM, Boot SRAM
4GB..12GB -> DRAM extension

So plenty of highmem, and then with LPAE you have
theoretically 12 GB of RAM. In an ARM32 system?

I think Arnd is gonna love this system for our highmem
experiments if that is something that is going to happen
often... Is that DRAM extension often mounted and
used?

quoted

quoted

Are these Broadcom chips hard to get for me?

Yes they are hard for you to get.

Isn't one of them this beast:
https://www.ebay.com/c/502488121

What the heck... someone must have been dumpster diving or been given a 
gift :) This one is a BCM97425 which is MIPS-based.

Or do you mean that this device is locked down like
a fortress and not really hackable? There seems to
be a UART on the back and all.

The devices are locked down and we don't send devices unless you are a 
customer. Since our business unit never signed up for Linaro we do not 
have an exchange program and every attempt in the past to send devices 
has been met with rejection. I did manage to get Kevin Hilman a couple 
of devices that we could consider using.

quoted

Have you got your hands on a Raspberry Pi 4? That one would be
quite similar to one of our Broadcom STB chips (7211) and I would be
curious to know if it even works there.

Pi 3 and 4 are 64bit Cortex A53 and A72 CPUs IIUC, so they
are in arch/arm64 and does not have this problem.

Your systems are curiously interesting, there is copious
highmem etc.

Yes, yes they are curious beasts :)
-- 
Florian

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