On 19/11/2012 11:14, Otavio Salvador wrote:
On Mon, Nov 19, 2012 at 7:11 AM, Stefano Babic <sbabic@denx.de mailto:sbabic@denx.de> wrote:
... +Falcon Mode relies on the SPL framework. In fact, to make booting faster, +U-Boot is split into two parts: the SPL (Secondary Program Loader) and U-Boot +image. In most implementations, SPL is used to start U-Boot when booting from +a mass storage, such as NAND or SD-Card. SPL has now support for other media, +and can be generalized seen as a way to start an image performing the minimum +required initialization. SPL initializes mainly the RAM controller, and after +that copies U-Boot image into the memory. The Falcon Mode extends this way +allowing to start the Linux kernel directly from SPL. A new command is added +to U-Boot to prepare the parameters that SPL must pass to the kernel, using +ATAGS or Device Tree.From the above text it seems the Falcon Mode is already available in SD-Card however this is not truth. Please rework this so it is clear what is already working and what needs to be done.
I reread the sentence, and I am really describing what SPL alone does, not Falcon mode. SPL is already available for different storage and there are some boards booting from SD. Check for CONFIG_SPL_MMC_SUPPORT in include/configs, there are plenty of boards using it.
On the other side, Falcon Mode (SPL + CONFIG_SPL_OS_BOOT) is set only for two boards, twister and devkit8000, bpth booting from NAND.
Best regards, Stefano Babic