Re: [PATCH v8 03/11] arm64: dts: ti: k3-am62a-mcu: Add R5F remote proc node

Daniel Schultz
2025-05-06T11:25:08Z

On 5/5/25 19:23, Andrew Davis wrote:
> On 5/5/25 11:00 AM, Daniel Schultz wrote:
>> Hey,
>>
>> On 5/5/25 17:22, Andrew Davis wrote:
>>> On 5/5/25 10:05 AM, Mendez, Judith wrote:
>>>> Hi Daniel,
>>>>
>>>> On 5/5/2025 4:55 AM, Daniel Schultz wrote:
>>>>> Hi,
>>>>>
>>>>> I'm unable to load the latest TI firmware
>>>>> (98efd20ec71f8c1c8f909d34ab656731) with this patch.
>>>>>
>>>>> [    7.012889] remoteproc remoteproc1: 79000000.r5f is available
>>>>> [    7.032640] remoteproc remoteproc1: powering up 79000000.r5f
>>>>> [    7.038626] remoteproc remoteproc1: Booting fw image am62a-mcu-
>>>>> r5f0_0-fw, size 53140
>>>>> [    7.057209] remoteproc remoteproc1: bad phdr da 0x79100000 mem
>>>>> 0x47ea0
>>>
>>> So this looks like the firmware has sections in the SRAM region.
>>> That would be the
>>> issue here.
>>>
>>>>> [    7.064716] remoteproc remoteproc1: Failed to load program
>>>>> segments: -22
>>>>>
>>>>> I figured out that the mcu sram node disappeared in v5. Apparently
>>>>> adding it back manually doesn't solve this problem. Any idea
>>>>> what's wrong?
>>>>
>>>> For am62ax, there should be several items changed with this v8
>>>> series in order for remoteproc to work with the TI default firmware:
>> What firmware did you use? I was using the latest public default
>> firmware from ti-linux-firmware.
>>>>
>>>> 1. memory carveouts were reduced to 15MB [0] & edge-ai memory
>>>> carveouts are not included here
>>>
>>> This shouldn't be an issue, the default firmware doesn't
>>> use the extended carveouts.
>> Yes, this is just the echo firmware.
>>>
>>>> 2. mcu_sram1 node removed [2]
>>>>
>>>
>>> So when you say you added back the SRAM node, did you also add the
>>> sram = <&mcu_ram>; in the core node?
>>
>> With that property added, I can load the firmware again! So, what's
>> the problem with adding this sram node and did you remove it?
>>
>
> Good to hear that fixed it.
>
> And we removed the SRAM node as I was unhappy with how we were
> handling reserving it.
> The firmware should declare usage of shared resources like this in its
> resource table,
> and the RProc driver should dynamically request the same from a normal
> SRAM pool.
> What we were doing before was to statically block out the whole SRAM
> node for use by
> the R5, and the driver would unconditionally map it, even if it was
> not used by the
> loaded firmware at all.
okay, that make sense.
>
> I wanted us to fix the above before upstreaming it so we left it out
> of this
> series. Next cycle we should have the better solution ready and posted
> for
> upstream.

thanks for the feedback. We're still on linux-ti 6.12 with this product.
So, I don't care if it's not fully working yet. I was just preparing our
device-trees with R5 and C7 nodes.

- Daniel

>
> Andrew
>
>> - Daniel
>>
>>>
>>> Andrew
>>>
>>>> If you want to catch up on the general direction for this series,
>>>> please refer to [3]. atm remoteproc can fail with the default FW,
>>>> but we are trying to move away from that firmware and this is the
>>>> first step in that direction.
>>>>
>>>> [0]
>>>> https://lore.kernel.org/linux-devicetree/0ab5c5ec-cde3-41f1-8adf-2419b31497c1@ti.com/
>>>> [1]
>>>> https://lore.kernel.org/linux-devicetree/04e77daf-e775-44fa-82bf-8b6ebf73bcef@ti.com/
>>>> [2]
>>>> https://lore.kernel.org/linux-devicetree/32358aa1-0c02-4f4d-9782-2d8376c0d9fc@ti.com/
>>>> [3]
>>>> https://lore.kernel.org/linux-devicetree/e131298f-3713-482a-a740-ff89709270b4@ti.com/
>>>>
>>>> ~ Judith
>>>>
>>>>>
>>>>> On 5/3/25 00:03, Judith Mendez wrote:
>>>>>> From: Hari Nagalla <hnagalla@ti.com>
>>>>>>
>>>>>> AM62A SoCs have a single R5F core in the MCU voltage domain.
>>>>>> Add the R5FSS node with the child node for core0 in MCU voltage
>>>>>> domain .dtsi file.
>>>>>>
>>>>>> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
>>>>>> Signed-off-by: Judith Mendez <jm@ti.com>
>>>>>> Acked-by: Andrew Davis <afd@ti.com>
>>>>>> ---
>>>>>>   arch/arm64/boot/dts/ti/k3-am62a-mcu.dtsi | 25
>>>>>> ++++++++++++++++++++++++
>>>>>>   1 file changed, 25 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm64/boot/dts/ti/k3-am62a-mcu.dtsi
>>>>>> b/arch/arm64/ boot/dts/ti/k3-am62a-mcu.dtsi
>>>>>> index 9ed9d703ff24..ee961ced7208 100644
>>>>>> --- a/arch/arm64/boot/dts/ti/k3-am62a-mcu.dtsi
>>>>>> +++ b/arch/arm64/boot/dts/ti/k3-am62a-mcu.dtsi
>>>>>> @@ -174,4 +174,29 @@ mcu_mcan1: can@4e18000 {
>>>>>>           bosch,mram-cfg = <0x0 128 64 64 64 64 32 32>;
>>>>>>           status = "disabled";
>>>>>>       };
>>>>>> +
>>>>>> +    mcu_r5fss0: r5fss@79000000 {
>>>>>> +        compatible = "ti,am62-r5fss";
>>>>>> +        #address-cells = <1>;
>>>>>> +        #size-cells = <1>;
>>>>>> +        ranges = <0x79000000 0x00 0x79000000 0x8000>,
>>>>>> +             <0x79020000 0x00 0x79020000 0x8000>;
>>>>>> +        power-domains = <&k3_pds 7 TI_SCI_PD_EXCLUSIVE>;
>>>>>> +        status = "disabled";
>>>>>> +
>>>>>> +        mcu_r5fss0_core0: r5f@79000000 {
>>>>>> +            compatible = "ti,am62-r5f";
>>>>>> +            reg = <0x79000000 0x00008000>,
>>>>>> +                  <0x79020000 0x00008000>;
>>>>>> +            reg-names = "atcm", "btcm";
>>>>>> +            resets = <&k3_reset 9 1>;
>>>>>> +            firmware-name = "am62a-mcu-r5f0_0-fw";
>>>>>> +            ti,atcm-enable = <0>;
>>>>>> +            ti,btcm-enable = <1>;
>>>>>> +            ti,loczrama = <0>;
>>>>>> +            ti,sci = <&dmsc>;
>>>>>> +            ti,sci-dev-id = <9>;
>>>>>> +            ti,sci-proc-ids = <0x03 0xff>;
>>>>>> +        };
>>>>>> +    };
>>>>>>   };
>>>>