ESP32-S3?

[zap8600]

How do I run this on an ESP32-S3?

[jcmvbkbc]

I guess the same way you run it on ESP32. You'd need to figure the address where the kernel goes and FLASH/PSRAM caches setup. Take this branch for a template, add a core variant for ESP32-S3 at this step, add different DTS and change kernel config specifying correct core and addresses at this step and use a compiler for the ESP32-S3 to build the kernel.

[zap8600]

Where would I find the headers to add the ESP32-S3's core variant. After that, what would I need to change in the DTS. Then I need to know what the correct core and address are so I can change them.

[jcmvbkbc]

Where would I find the headers to add the ESP32-S3's core variant

I'd start here, but I see that these overlays are incomplete. Maybe ask for the linux parts? Or maybe the overlay was published elsewhere, I just couldn't find it by quick googling.

what would I need to change in the DTS

Take the DST for the ESP32 and look at the devices and memories that you care about. Fix the register addresses/sizes that are wrong.

what the correct core and address are

The correct core is esp32s3, or whatever you name it when you import it. The address -- you need to think about it: it must be in the FLASH, be mappable through the FLASH cache and you'd need to make a partition in the FLASH for it. It's not the single correct answer, but rather a range of more or less convenient options.

[zap8600]

I'd start here, but I see that these overlays are incomplete. Maybe ask for the linux parts? Or maybe the overlay was published elsewhere, I just couldn't find it by quick googling.

Ask Espressif for the Linux parts? What do I exactly need? What's missing?

[zap8600]

@jcmvbkbc I think I found the missing headers.

[zap8600]

I don't think I need to change anything else besides the core variant headers. I'll try to build it and give it a test in QEMU. Please tell me if I need to change anything else.

[jcmvbkbc]

I think I found the missing headers.

Yeah, that's correct.

tell me if I need to change anything else.

For the linux kernel itself I think that's all.

[zap8600]

For the linux kernel itself I think that's all.

I don't need to change anything else at all? If so, then what about buildroot?

[jcmvbkbc]

I don't need to change anything else at all?

Check FLASH cache setup in the bootloader and rebuild it with the esp32s3 compiler.

what about buildroot?

No changes, just rebuild with the esp32s3 compiler.

[zap8600]

I don't need to change anything else at all?

Check FLASH cache setup in the bootloader and rebuild it with the esp32s3 compiler.

what about buildroot?

No changes, just rebuild with the esp32s3 compiler.

So all I need to do is switch to the ESP32-S3 compiler?

[jcmvbkbc]

So all I need to do is switch to the ESP32-S3 compiler?

Yes.

[zap8600]

There were problems when compiling Linux, so I don't think it'll work for now.

[max1220]

I have compiled Linux for the ESP32 S3 successfully.
I don't think I've done no more than importing the missing headers, and adding a DTS.

Keep in mind that I've not tried booting it yet, because QEMU would need a port for the ESP32 as well(at least the correct memory mapping).
Also the bootloader currently uses ESP32-specific ROM functions, and so currently doesn't work on the ESP32 S3.

[jcmvbkbc]

There were problems when compiling Linux, so I don't think it'll work for now.

@zap8600 there shouldn't be any if things are configured correctly. I can take a look if you share the build command, build log and the source tree.

[zap8600]

I don't think I've done no more than importing the missing headers, and adding a DTS.

Can you provide the DTS?