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SubjectRe: [v5.4 stable] arm: stm32: Regression observed on "no-map" reserved memory region
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Hi Quentin

On 4/22/21 2:59 PM, Quentin Perret wrote:
> On Wednesday 21 Apr 2021 at 07:33:52 (-0700), Florian Fainelli wrote:
>> It is not, otherwise I would have noticed earlier, can you try the same
>> thing that happens on my platform with a reserved region (without
>> no-map) adjacent to a reserved region with 'no-map'?
>
> I just tried, but still no luck. FTR, I tried to reproduce your setup
> with the following DT:
>
> memory@40000000 {
> reg = <0x00 0x40000000 0x01 0x00>;
> device_type = "memory";
> };
>
> reserved-memory {
> #address-cells = <2>;
> #size-cells = <2>;
> ranges;
>
> foo@fdfff000{
> reg = <0x00 0xfdfff000 0x0 0x1000>;
> };
> bar@fe000000{
> reg = <0x00 0xfe000000 0x0 0x2000000>;
> no-map;
> };
> };
>
> And with 5.4.102 and 5.10.31 I get the following in /proc/iomem
>
> <...>
> 40000000-fdffffff : System RAM
> 40080000-412cffff : Kernel code
> 412d0000-417affff : reserved
> 417b0000-419f8fff : Kernel data
> 48000000-48008fff : reserved
> f7c00000-fdbfffff : reserved
> fdfff000-fdffffff : reserved
> fe000000-ffffffff : reserved
> 100000000-13fffffff : System RAM
> <...>
>
> which looks about right. I'll keep trying a few other things.

Did you get time to continue some tests on this issue ?

On my side this DT is not working:

memory@c0000000 {
reg = <0xc0000000 0x20000000>;
};

reserved-memory {
#address-cells = <1>;
#size-cells = <1>;
ranges;

gpu_reserved: gpu@d4000000 {
reg = <0xd4000000 0x4000000>;
no-map;
};
};

Let me know if I can help.

regards
Alex

> Thanks,
> Quentin
>

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