[PATCH 4/5] ARM: Add basic support for EcoNet EN7523 SoC

[Bert Vermeulen]

On 8/9/21 2:46 PM, Geert Uytterhoeven wrote:
>> I didn't make that patch, but it turns out it's needed to get PSCI working;
>> detection hangs without it. That makes no sense to me, but I'll examine further.
> 
> Probably PSCI relies on the memory contents at the start of RAM not
> being overwritten?

It turns out to hang at the first SMC call, for PSCI_0_2_FN_PSCI_VERSION. I 
assume the receiver of that call, ATF, got dropped in that region by the 
vendor's U-Boot.

> Does it help if you remove the first 512 KiB from the /memory node
> (which should be declared in en7523-evb.dts instead of en7523.dtsi
> BTW)?
No it doesn't, was just trying to work out why not, in your 
fdt_check_mem_start().

Anyway that was Arnd's first suggestion, but I think his second suggestion 
(teach fdt_check_mem_start() about /memreserve/) is the cleaner approach to 
this. Opinions?


-- 
Bert Vermeulen
bert at biot.com