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 bugs 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. Another bunch of the issues in the FAT write code has been revealed while removing predefined file size limit in DFU MMC code and then running sandbox tests.
I hope that my fixes for FAT code will be helpful for non-RPi users too.
Best regards Marek Szyprowski Samsung R&D Institute Poland
Changelog:
v4: - rechecked the FAT related fixes, it turned out that much simpler patch fixes both issues discovered while working on DFU support; added simple sandbox based tests reveleaing the issue and showing correctness of the fix - rebased patches onto current u-boot's master branch: 4b19b89ca4a8 ("Merge tag 'rpi-next-2020.01' of https://github.com/mbgg/u-boot")
v3: https://patchwork.ozlabs.org/cover/1200793/ - fixed one more FAT issue revealed by sandbox tests
v3: (patch 6/6 posted separately): https://patchwork.ozlabs.org/patch/1195645/ - fixed non-RPi4 builds (missing #else ENV_DFU_SETTINGS def) - removed config.txt entity (not needed in uboot-based boot) - switched arm64 kernel filename to 'Image'
v2: https://patchwork.ozlabs.org/cover/1166589/ - added changes to rpi_4_defconfig too (arm64 version) - extended DFU entity list by confix.txt, cmdline.txt and Image.gz - fixed missing '\0' at the end of dfu_alt_info env - added reviewed-by tags - added patches for DFU MMC to remove file size limit - added patch for fat write to fix issues on non-zero file offset (revealed by previous patch)
v1: https://patchwork.ozlabs.org/cover/1162770/ - initial version
Patch summary:
Marek Szyprowski (6): fat: write: fix broken write to fragmented files fat: write: adjust data written in each partial write dfu: mmc: rearrange the code dfu: mmc: remove file size limit for io operations 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 +++ configs/rpi_4_defconfig | 11 +++ drivers/dfu/dfu_mmc.c | 93 +++++++++++++--------- drivers/usb/gadget/dwc2_udc_otg.c | 2 + drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c | 12 +-- fs/fat/fat_write.c | 8 +- include/configs/rpi.h | 20 +++++ 7 files changed, 112 insertions(+), 45 deletions(-)