latest u-boot branch for Marvell Armada 88F3720

[Marek Behun]

On Thu, 2 Apr 2020 14:18:24 +0200
Stefan Roese <sr at denx.de> wrote:

> Hi Moritz,
> 
> On 02.04.20 13:30, Moritz Berghof wrote:
> > it's really great that you answered so fast and helpfully, thank you!
> > 
> > It's great you want get the board ported to mainline. Me too.
> > 
> > 
> > I build the U-boot mainline and uploaded on my espressobin. Used the ATF
> > and WTMI from Marvell.
> > 
> > When I start the flashed .bin file, the U-boot crashed at this following
> > point. "Synchronous Abort" handler, esr 0x96000210  
> 
> Looks like an issue with SATA - not sure why. You might want to try to
> disable SATA / AHCI for testing.
> 
> > Prompt is attached at this mail.
> > 
> > I think there is a problem with the RAM. For example, I build the U-Boot
> > for 1 GB RAM with the Marvell U-boot and the mainline/master. Important
> > constant is DDR_TOPOLOGY=2
> > 
> > make DEBUG=0 USE_COHERENT_MEM=0 LOG_LEVEL=20 SECURE=0 CLOCKSPRESET=CPU_1000_DDR_800 DDR_TOPOLOGY=2 WTP=... BOOTDEV=SPINOR PARTNUM=0 PLAT=a3700 all fip
> > 
> > But when the u-boot mainline starts it promts:
> > U-Boot 2020.04-rc3-00188-g350c44dfb9 (Mar 31 2020 - 10:52:01 +0200)
> > 
> > DRAM:  512 MiB
> > 
> > 
> > The Marvell U-boot promts DRAM: 1 GiB
> > 
> > 
> > 
> > So my question is, where do you define the RAM Size?  
> 
> Take a look at arch/arm/mach-mvebu/arm64-common.c. Perhaps this code
> needs some changes for CONFIG_ARMADA_A3700 similar to what is done
> for CONFIG_ARMADA_8K ?
> 
> I suggest you debug in this area a bit to see, where it goes wrong.

There is a register on A3720 which should contain information about how
much RAM the system has (0xD0000200 if the device contains only one
DDR chip). It is written by the TIM image. I am going to send a patch
which uses this register to determine RAM size for Turris Mox.

The thing is that without upgrade of TIM header some Moxes may report
1 GB RAM in this register, although they only have 512 MB. So a call to
get_ram_size will still be needed.

Marek