[RFC PATCH 0/2] rpi5: initial support

[Tom Rini]

On Sat, Nov 18, 2023 at 05:41:34PM +0100, Dmitry Malkin wrote:

> I was not able to boot rpi5 with the latest master. I run into
> dram_init() error:
> > DRAM:  mbox: Timeout waiting for response
> > bcm2835: Could not query ARM memory size
> 
> Apparently there is a new peripheral layout and ARMC MBOX has a
> different offset within.
> 
> Turns out there is a compatible node "brcm,bcm2835-mbox" for all RPIs
> (bcm238x/bcm271x).
> 
> After fixing this I got to the point where mmu_setup() was hanging
> (looks like it was due to incorrect mapping). So I've added a
> definition of first gigabyte of RAM and SOC range for bcm2712 into
> rpi.c.
> 
> With those two patches and rpi_arm64_defconfig (with disabled
> CONFIG_VIDEO_BCM2835) I'm able to get a working u-boot prompt (over
> serial). FDT comes from firmware (EEPROM).
> 
> These patches are based on v2024.01-rc2 and tested with RPI5 8GB.
> 
> Known issues:
> * CONFIG_VIDEO_BCM2835 doesn't work.
> * MBOX get board revision (0x10002) doesn't work (the response status
> is 0x8000_0001).
> 
> 
> Dmitry Malkin (2):
>   rpi5: add alternative way to get MBOX address via FDT node
>   rpi5: add initial memory map for bcm2712
> 
>  arch/arm/mach-bcm283x/include/mach/base.h |  1 +
>  arch/arm/mach-bcm283x/include/mach/mbox.h |  4 ++--
>  arch/arm/mach-bcm283x/init.c              | 29 ++++++++++++++++++++++-
>  3 files changed, 31 insertions(+), 3 deletions(-)
> 

I'm glad to someone is looking at this currently, thanks! I suspect
we'll need a number of device compatible updates (and related tweaks) to
get most things working.

-- 
Tom
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