linux-kernel - Re: [PATCH 1/3] arm64: dts: meson-gx: add ATF BL32 reserved-memory region

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Date:   Thu, 27 Jan 2022 11:44:25 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Vyacheslav <adeep@...ina.in>,
        Christian Hewitt <christianshewitt@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...libre.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] arm64: dts: meson-gx: add ATF BL32 reserved-memory
 region

Hi,

On 26/01/2022 06:35, Vyacheslav wrote:
> Hi!
> 
> 26.01.2022 07:49, Christian Hewitt wrote:
>> Add an additional reserved memory region for the BL32 trusted firmware
>> present in many devices that boot from Amlogic vendor u-boot.
>>
>> Suggested-by: Mateusz Krzak <kszaquitto@...il.com>
>> Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
>> ---
>>   arch/arm64/boot/dts/amlogic/meson-gx.dtsi | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
>> index 6b457b2c30a4..aa14ea017a61 100644
>> --- a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
>> +++ b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
>> @@ -49,6 +49,12 @@
>>               no-map;
>>           };
>>   +        /* 32 MiB reserved for ARM Trusted Firmware (BL32) */
>> +        secmon_reserved_bl32: secmon@...0000 {
>> +            reg = <0x0 0x05300000 0x0 0x2000000>;
>> +            no-map;
>> +        };
>> +
> How do I check if we need a similar patch for axg boards?
> 
> 
>>           linux,cma {
>>               compatible = "shared-dma-pool";
>>               reusable;
>>
> 

For AXG board with BL32 booting from vendor u-boot, yes.

Neil