[PATCH 0/6 v14] KASan for Arm

[Florian Fainelli]

On 10/1/2020 2:18 PM, Linus Walleij wrote:
> On Thu, Oct 1, 2020 at 9:19 PM Florian Fainelli <f.fainelli at gmail.com> wrote:
> 
>> 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?
> 
>>> 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.

> 
>> 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