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| [https://www.dropbox.com/s/s4wvj1eaewfo7ie/FIXME-Demonstrate-DFU-usage-for-DHCOR-recovery.patch_2021-12-01.zip?dl=0 FIXME-Demonstrate-DFU-usage-for-DHCOR-recovery.patch_2021-12-01.zip]
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| This patch configures U-Boot SPL for DHCOR SoM to permit DFU upload of
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| SPL and subsequent u-boot.itb for recovery or commissioning purposes.
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| It is not possible to use this SPL build for production due to its
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| large size.
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| Compile U-Boot for the DHCOR Avenger96 target:
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| $ make stm32mp15_dhcor_basic_defconfig
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| $ make -j`nproc`
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| * Install dfu-util on the host PC (in debian this is package 'dfu-util')
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| * Power off the Avenger96 board.
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| * Connect both USB-serial console and USB-OTG microB ports to host PC.
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| * Switch Avenger96 to USB boot mode -- BOOT0..2 switches all set to 0.
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| * Power on the Avenger96 board.
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| * Verify using '$ dmesg' that a new device has been detected as follows:
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| New USB device found, idVendor=0483, idProduct=df11, bcdDevice= 2.00
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| New USB device strings: Mfr=1, Product=2, SerialNumber=3
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| Product: DFU in HS Mode @Device ID /0x500, @Revision ID /0x0000
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| Manufacturer: STMicroelectronics
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| * Upload U-Boot SPL:
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| $ dfu-util -a 1 -D u-boot-spl.stm32
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| * Upload U-Boot proper:
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| $ dfu-util -a 0 -D u-boot.itb
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| At this point, SPL will wait for user to press "Ctrl-C" on serial console. When ready to interact with U-Boot, press Ctrl-C to start the bootloader.
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| Note that this is adapted from ST article, with removed requirement for custom DFU implementation and additional bootloader components, which are not required on this platform:
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| [https://wiki.st.com/stm32mpu/wiki/How_to_load_U-Boot_with_dfu-util https://wiki.st.com/stm32mpu/wiki/How_to_load_U-Boot_with_dfu-util]
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