[U-Boot] [RFC PATCH v1 0/6] SPL: DFU Support in SPL

[Ravi Babu]

Traditionally the DFU support is available only
as part 2nd stage boot loader(u-boot) and DFU
is not supported in SPL.

The SPL-DFU feature is useful for boards which has
only USB inteface and do not have external interface
like ethernet or MMC/SD to boot the board.

This feature enable DFU to be builtin part of SPL and
boot the u-boot directly by loading u-boot image
to RAM from PC using dfu-util.

This patch series adds DFU support in SPL to flash binary
images to factory or bare-metal boards to memory
devices like SPI, RAM, eMMC, MMC/SD card using
USB interface.
As a reference, refer to application note [3] on SPL-DFU
support based on 2014.07 u-boot.

steps for SPL-DFU/RAM:
1) Soc ROMcode loads the u-boot-spl.bin(+DFU) to IRAM 
from PC host via usb interface and execute DFU(RAM/SPI).
2) if DFU/RAM is selected, then load u-boot.img
to RAM using dfu-util from PC-host.
3) After loading u-boot, press ctrl+c to exit to jump
to u-boot. Once u-boot

steps for SPL-DFU/SPI:
1) Soc ROMcode loads the u-boot-spl.bin(+DFU) to IRAM 
from PC host via usb interface and execute DFU(RAM/SPI).
2) If DFU/SPI is selected, then load MLO/u-boot/kernel/dtb
images directly to spi partitions.

Note: I could not find better option to isolate dfu source
to include/exclude in Makefile when SPL-DFU feature
enabled/disabled, please suggest any better option.

Tested on dra7xx SoCs family.
[1] is EVM console output with SPL-DFU/SPI enabled.
[2] is ubuntu host console output.

references:
[1] http://pastebin.ubuntu.com/16730701/
[2] http://pastebin.ubuntu.com/16730765/
[3] http://www.ti.com/lit/an/sprac33/sprac33.pdf

Ravi Babu (6):
  spl: dfu: add dfu support in SPL
  spl: dfu: adding dfu support functions for SPL-DFU
  dfu: spl: add generic spl-dfu function in common-spl
  dra7x: spl: dfu: adding SPL-DFU support for dra7x platform
  dfu: spl: dra7x: enable SPL-dfu support for dra7x platform
  dfu: spl: am335x: SPL-DFU support for am335x

 Kconfig                           |   33 ++++++++
 board/ti/am335x/board.c           |   15 ++++
 board/ti/dra7xx/evm.c             |   17 ++++
 common/Makefile                   |   26 +++++--
 common/command.c                  |    2 +-
 common/spl/Makefile               |    1 +
 common/spl/spl.c                  |    9 +++
 common/spl/spl_dfu.c              |  154 +++++++++++++++++++++++++++++++++++++
 include/configs/am335x_evm.h      |   17 +++-
 include/configs/dra7xx_evm.h      |    8 +-
 include/configs/ti_omap5_common.h |    2 -
 include/spl.h                     |   11 +++
 scripts/Makefile.spl              |   13 ++++
 13 files changed, 293 insertions(+), 15 deletions(-)
 create mode 100644 common/spl/spl_dfu.c

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1.7.9.5