[U-Boot] [RFC PATCH v2 0/5] SPL: DFU Support in SPL

[Lukasz Majewski <l.majewski@samsung.com>]

Hi Ravi,

> 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
> does not have MMC/SD, ethernet boot mechanism
> to boot the board and only has USB inteface.
> 
> This patch add DFU support in SPL with RAM
> memory device support to load and execute u-boot 
> from PC over USB interface. And then leverage
> full functional feature of DFU in u-boot to
> flash boot inital binary images to factory or
> bare-metal boards to memory devices like SPI,
> 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 to build SPL-DFU/RAM:
> This SPL-DFU support can be enabled through
> Menuconfig->Boot Images->Enable SPL-DFU support
> 1) Soc ROMcode loads the u-boot-spl.bin(+DFU) to IRAM 
> from PC host via usb interface and execute DFU.
> 2) Then load u-boot.img to RAM using dfu-util from PC-host
> with -R switch to boot u-boot.
> #sudo dfu-util -c 1 -i 0 -a 0 -D u-boot.img -R
> 


I wanted to add this patch series for testing. Unfortunately, I cannot
apply this code to the newest u-boot-usb/master (SHA1:
eb364c3dc28d59d33e823470d07746b22a8e6fee)

Please rebase your code on top of this branch.

Thanks in advance,

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group