[PATCH 0/2] Enable USB MSC Boot for AM62, AM62A and AM62P

[Siddharth Vadapalli]

On Fri, Feb 28, 2025 at 10:11:53AM -0600, Javier Tia wrote:
> Hi Siddharth,

Hello Javier,

> 
> On Wed, Feb 26, 2025, at 4:35 AM, Siddharth Vadapalli wrote:
> > Hello,
> >
> > This series adds config fragment for enabling USB MSC boot and USB
> > Storage devices which are applicable to AM62, AM62A and AM62P SoCs.
> >
> > Series is based on commit
> > 8dd7186ca7 Merge patch series "Remove "saveenv" functionality from am57xx evms"
> > of the next branch of U-Boot.
> >
> > Series has been tested on AM62A7-SK, AM625-SK and AM62P5-SK for USB MSC
> > boot where the bootloaders were generated in the following manner:
> > 1. AM62A7-SK (AM62A SoC):
> > - tiboot3.bin
> > 	=> am62ax_evm_r5_defconfig + am62x_r5_usbmsc.config
> > - tispl.bin and u-boot.img
> > 	=> am62ax_evm_a53_defconfig + am62x_a53_usbmsc.config
> > 2. AM625-SK (AM62 SoC):
> > - tiboot3.bin
> > 	=> am62x_evm_r5_defconfig + am62x_r5_usbmsc.config
> > - tispl.bin and u-boot.img
> > 	=> am62x_evm_a53_defconfig + am62x_a53_usbmsc.config
> > 3. AM62P5-SK (AM62P SoC):
> > - tiboot3.bin
> > 	=> am62px_evm_r5_defconfig + am62x_r5_usbmsc.config
> > - tispl.bin and u-boot.img
> > 	=> am62px_evm_a53_defconfig + am62x_a53_usbmsc.config
> >
> > The images were flashed to a USB Flash Drive and were connected to the
> > Type-C interface on each of the boards which supports USB MSC Boot.
> 
> I have access to a TI board. I want to test the USB boot.
> 
> Are there any special requirements around the flash image?
> 
> Would it be sufficient to flash the WIC image generated by the Arago project?

Yes, flashing the WIC Image from the Arago project to generate the /boot
partition followed by replacing the bootloaders there with the ones
built using the usbmsc.config config fragment shoudl work.

> 
> Could I use the same U-Boot images with these configs to boot from UART and SD card? I meant, if these configs will create conflicts with other boot modes.

The functionality associated with the configs disabled in the respective
config fragments for r5 and a53 will be lost, namely:
r5_usbmsc.config => SD Boot will not work but UART Boot should still
work since the config corresponding to it hasn't been disabled.
a53_usbmsc.config => Both SD Boot and UART Boot will work.

If your use-case requires SD Boot in addition to USB MSC Boot at the R5
SPL stage, you could try disabling a different config in the platform's
base r5_defconfig and enable SD configs in its place.

Regards,
Siddharth.