[U-Boot] [PATCH v3 1/3] Add README for the "Falcon" mode

[Stefano Babic]

On 19/11/2012 11:14, Otavio Salvador wrote:
> On Mon, Nov 19, 2012 at 7:11 AM, Stefano Babic <sbabic at denx.de
> <mailto:sbabic at 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

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