An updated variant of the older patch http://lists.denx.de/pipermail/u-boot/2015-February/204024.html
These patches are not for the u-boot code (unless u-boot decides to cannibalize the 'fel' tool later) but still provide a glue layer between the Allwinner BROM code and the u-boot SPL code. And need to play nice with both of them.
The updated 'fel' tool is supposed to be used together with u-boot v2015.04 and provide support for booting regular u-boot SPL binaries over USB via FEL mode. So that a special u-boot sunxi FEL configuration can be eventually dropped in the future.
The usage instructions are in the 'New method of booting u-boot over USB (u-boot v2015.04 and later versions)' section of the linux-sunxi wiki page http://linux-sunxi.org/index.php?title=FEL/USBBoot&oldid=12979
It temporarily moves the BROM data from the first 32 KiB of SRAM into a different SRAM section before calling the SPL code. And then moves it back before returning from the SPL back to the FEL code in BROM. This provides a contiguous 32 KiB block in the beginning of SRAM for use by the SPL. And in the case if an extra SRAM section is not available, we can at least "defragmemnt" the free memory areas and still provide a contiguous ~21 KiB block to the SPL in the beginning of SRAM.
This code is also available in the following branch: https://github.com/ssvb/sunxi-tools/commits/20150206-fel-large-spl-support
Siarhei Siamashka (2): fel: Split 'aw_fel_get_version' into 'get' and 'print' variants fel: New command for loading U-Boot SPL binaries in eGON format
fel-to-spl-thunk.S | 172 +++++++++++++++++++++++++++++++ fel-to-spl-thunk.h | 69 +++++++++++++ fel.c | 291 +++++++++++++++++++++++++++++++++++++++++++++++++---- 3 files changed, 510 insertions(+), 22 deletions(-) create mode 100644 fel-to-spl-thunk.S create mode 100644 fel-to-spl-thunk.h