Hi All
This patchset enables support for DFU over USB protocol on Raspberry Pi4 board. The board has DWC2 UDC controller connected to the USB-C power connector. Enabling DFU on it, make the u-boot development much more convenient, as one no longer needs to swap SD-card between RPi4 board and host machine to update the u-boot binary.
Patches are based on current 'master' u-boot branch. They were tested on the 2019-07-10-raspbian-buster-lite.img sd-card image with the following lines added to config.txt: dtoverlay=dwc2,dr_mode=peripheral dtparam=i2c_arm=on dtparam=spi=on enable_uart=1 uart_2ndstage=1 kernel=u-boot.bin
To enable DFU, one has to enter follwing command: # dfu 0 mmc 0
During the development of this feature I've encountered a serious bug in FAT write code. Over-writing discontiguous files always caused serious filesystem corruption. This was especially anoying, because the system environment is kept on FAT volume in uboot.env file, so 'saveenv' basically corrupted the boot partiting on the second call.
I hope that my fix for FAT code will be helpful for non-RPi users too.
Best regards Marek Szyprowski Samsung R&D Institute Poland
Patch summary:
Marek Szyprowski (3): fat: write: fix broken write to fragmented files usb: dwc2_udc_otg: add bcm2835 SoC (Raspberry Pi4) support config: enable DFU over USB on Raspberry Pi4 boards
configs/rpi_4_32b_defconfig | 11 +++++++++++ drivers/usb/gadget/dwc2_udc_otg.c | 2 ++ drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c | 12 ++++++------ fs/fat/fat_write.c | 6 +++--- include/configs/rpi.h | 10 ++++++++++ 5 files changed, 32 insertions(+), 9 deletions(-)