[PATCH] arm64: dts: ti: k3-am64-main: Add SYSFW reserved ranges in OCRAM

[Vignesh Raghavendra]

+Aswath

On 6/12/21 12:46 AM, Nishanth Menon wrote:
> On 19:36-20210609, Vignesh Raghavendra wrote:
>> Last 256K of OCRAM (256K at 0x701c0000) is reserved for SYSFW usage. Hence
>> add an entry in DT so that its not used for generic pool memory
>> allocation.
> 
> Are you really sure?? I know that I had set a budget for 16K in sysfw
> when I did the memory split up for sysfw of which 16k is actually used.
> 
> Not sure where this 256K bucket started off from.. am I missing
> something here?
> 

Per: http://software-dl.ti.com/tisci/esd/latest/5_soc_doc/am64x/firewalls.html

24	dmsc	0x44060000	0x4407BFFF	dmsc,rwcd	 	 // alias for 0x701E0000
24	dmsc	0x701FC000	0x701FFFFF	sproxy_private,rwcd	 	 
24	dmsc	0x4407C000	0x4407FFFF	sproxy_private,rwcd	 	 
24	dmsc	0x701C0000	0x701DFFFF	everyone,rwcd	 	 

So it looks like only 128K at 0x701E0000 is firewalled off. 
Will update the patch.

This makes me wonder why ATF is being moved to 0x701a0000-0x701c0000
leaving a hole at 0x701C0000-0x701DFFFF? 


> 
>>
>> Without this certain drivers using SRAM as generic shared memory pool
>> may end up being allocated memory from this range and will lead to boot
>> time crash when the reserved range is accessed (due to firewall
>> violation).
>>
>> Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
>> ---
>>  arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> index f1c42ef05e52..77b88e536534 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> @@ -16,6 +16,10 @@ oc_sram: sram at 70000000 {
>>  		atf-sram at 0 {
>>  			reg = <0x0 0x1a000>;
>>  		};
>> +
>> +		dmsc-sram at 1c0000 {
>> +			reg = <0x1c0000 0x40000>;
> 
>> +		};
>>  	};
>>  
>>  	gic500: interrupt-controller at 1800000 {
>> -- 
>> 2.31.1
>>
>