linux-kernel - Re: [PATCH v4 3/3] arm64: dts: ti: k3-am64-main: Update the location of TF-A

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Message-ID: <bf7074a4-534b-25f9-b70e-4985ca070a6f@ti.com>
Date:   Wed, 16 Jun 2021 14:13:23 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     Nishanth Menon <nm@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>, Suman Anna <s-anna@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/3] arm64: dts: ti: k3-am64-main: Update the location
 of TF-A

Hi Nishanth,

On 16/06/21 5:50 am, Nishanth Menon wrote:
> On 23:13-20210615, Aswath Govindraju wrote:
>> Due to a limitation for USB DFU boot mode, SPL load address has to be less
>> than  or equal to 0x70001000. So, load address of SPL and TF-A have been
>> moved to 0x70000000 and 0x701c4000 respectively.
>>
>> Therefore, update TF-A's location in the device tree node.
> 
> One additional topic to add is the dependency on bootloader update for
> this as well. I know things are chicken or egg kind of problem, but
> will be good to mention requires newer version than 2021.xx version of
> u-boot as this is an "breaking" change. And, if we block both regions
> off for bootloader compatibility, that is not feasible given the
> limited SRAM available as well.
> 

Will include this in the repsin by indicating the version in which the
ATF has been moved.

Thanks,
Aswath

>>
>> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
>> ---
>>  arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> index 6a883f4349cb..7ab3652dfdfb 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> @@ -24,8 +24,8 @@
>>  		#size-cells = <1>;
>>  		ranges = <0x0 0x00 0x70000000 0x200000>;
>>  
>> -		tfa-sram@0 {
>> -			reg = <0x0 0x1c000>;
>> +		tfa-sram@...000 {
>> +			reg = <0x1c4000 0x1c000>;
>>  		};
>>  
>>  		dmsc-sram@...000 {
>> -- 
>> 2.17.1
>>
>