From: Linus Walleij <linus.walleij@linaro.org>
To: Florian Fainelli <f.fainelli@gmail.com>, Arnd Bergmann <arnd@arndb.de>
Cc: Abbott Liu <liuwenliang@huawei.com>,
Russell King <linux@armlinux.org.uk>,
Mike Rapoport <rppt@linux.ibm.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Ard Biesheuvel <ardb@kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 0/6 v14] KASan for Arm
Date: Thu, 1 Oct 2020 23:18:21 +0200 [thread overview]
Message-ID: <CACRpkdYiTVYafzarSJh8ajOsRNP9NOXqzq8dWyQDUOsfc4S97w@mail.gmail.com> (raw)
In-Reply-To: <39a52fa8-4297-0072-755f-8c904227f12d@gmail.com>
On Thu, Oct 1, 2020 at 9:19 PM Florian Fainelli <f.fainelli@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
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.
> 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.
Yours,
Linus Walleij
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next prev parent reply other threads:[~2020-10-01 21:20 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 15:22 [PATCH 0/6 v14] KASan for Arm Linus Walleij
2020-10-01 15:22 ` [PATCH 1/6 v14] ARM: Handle a device tree in lowmem Linus Walleij
2020-10-01 16:45 ` Florian Fainelli
2020-10-01 20:31 ` Linus Walleij
2020-10-02 11:01 ` Ard Biesheuvel
2020-10-04 20:50 ` Linus Walleij
2020-10-05 7:14 ` Ard Biesheuvel
2020-10-05 9:14 ` Ard Biesheuvel
2020-10-05 13:27 ` Linus Walleij
2020-10-05 13:30 ` Linus Walleij
2020-10-05 13:36 ` Ard Biesheuvel
2020-10-05 14:22 ` Ard Biesheuvel
2020-10-06 9:11 ` Linus Walleij
2020-10-06 9:16 ` Ard Biesheuvel
2020-10-06 9:19 ` Linus Walleij
2020-10-06 8:47 ` Linus Walleij
2020-10-06 8:48 ` Ard Biesheuvel
2020-10-05 12:26 ` Linus Walleij
2020-10-01 15:22 ` [PATCH 2/6 v14] ARM: Disable KASan instrumentation for some code Linus Walleij
2020-10-01 15:22 ` [PATCH 3/6 v14] ARM: Replace string mem* functions for KASan Linus Walleij
2020-10-01 15:22 ` [PATCH 4/6 v14] ARM: Define the virtual space of KASan's shadow region Linus Walleij
2020-10-01 15:22 ` [PATCH 5/6 v14] ARM: Initialize the mapping of KASan shadow memory Linus Walleij
2020-10-01 15:22 ` [PATCH 6/6 v14] ARM: Enable KASan for ARM Linus Walleij
2020-10-01 19:19 ` [PATCH 0/6 v14] KASan for Arm Florian Fainelli
2020-10-01 20:34 ` Linus Walleij
2020-10-01 20:38 ` Florian Fainelli
2020-10-01 21:18 ` Linus Walleij [this message]
2020-10-01 21:29 ` Arnd Bergmann
2020-10-01 21:35 ` Florian Fainelli
2020-10-03 15:50 ` Ard Biesheuvel
2020-10-04 8:06 ` Ard Biesheuvel
2020-10-04 8:41 ` Ard Biesheuvel
2020-10-04 9:09 ` Ard Biesheuvel
2020-10-04 20:24 ` Florian Fainelli
2020-10-05 8:40 ` Linus Walleij
2020-10-06 13:21 ` Linus Walleij
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