[PATCH 1/7] arm: juno: Fix Juno address variables

Tom Rini trini at konsulko.com
Thu Mar 26 03:38:05 CET 2020

On Wed, Mar 25, 2020 at 02:46:56PM +0000, Andre Przywara wrote:

> The U-Boot documentation explains that variables ending with "_r" hold
> addresses in DRAM, while those without that ending point to flash/ROM.
> The default variables for the Juno board pointing to the kernel and DTB
> load addresses were not complying with this scheme: they lack the
> extension, but point to DRAM. This is particularly confusing since the
> Juno board features parallel NOR flash, so there *is* a memory mapped
> NOR address holding a DTB, for instance.
> Fix the variables to use the proper names. On the way adjust the FDT
> load address to be situated *before* the kernel, since users happened
> to overwrite the DTB by the kernel clearing its .BSS section during
> initialisation.
> That fixes loading debug kernels, which happened to overwrite the DTB on
> certain setups.
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> Reviewed-by: Liviu Dudau <liviu.dudau at arm.com>
> -				"fdt_addr=0x83000000\0" \
> +				"fdt_addr_r=0x80000000\0" \
>  				"fdt_high=0xffffffffffffffff\0" \
>  				"initrd_high=0xffffffffffffffff\0" \

On a related note, using fdt_high=0xff... to disable relocation is a bad
idea and can lead to U-Boot knowing we have it at an invalid (unaligned)
location but doing nothing and causing problems down the chain.  Please
use bootm_size or similar (documented in the README, still) to limit
where the fdt can be.  Thanks!

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