[U-Boot] [U-Boot, v4, 2/2] rpi: passthrough of the firmware provided FDT blob

[Tom Rini]

On Fri, Nov 11, 2016 at 11:59:07AM +0100, Cédric Schieli wrote:

> Raspberry firmware used to pass a FDT blob at a fixed address (0x100),
> but this is not true anymore. The address now depends on both the
> memory size and the blob size [1].
> 
> If one wants to passthrough this FDT blob to the kernel, the most
> reliable way is to save its address from the r2/x0 register in the
> U-Boot entry point and expose it in a environment variable for
> further processing.
> 
> This patch just does this:
> - save the provided address in the global variable fw_dtb_pointer
> - expose it in ${fdt_addr} if it points to a a valid FDT blob
> 
> There are many different ways to use it. One can, for example, use
> the following script which will extract from the tree the command
> line built by the firmware, then hand over the blob to a previously
> loaded kernel:
> 
> fdt addr ${fdt_addr}
> fdt get value bootargs /chosen bootargs
> bootz ${kernel_addr_r} - ${fdt_addr}
> 
> Alternatively, users relying on sysboot/pxe can simply omit any FDT
> statement in their extlinux.conf file, U-Boot will automagically pick
> ${fdt_addr} and pass it to the kernel.
> 
> [1] https://www.raspberrypi.org/forums//viewtopic.php?f=107&t=134018
> 
> Signed-off-by: Cédric Schieli <cschieli at gmail.com>
> Acked-by: Stephen Warren <swarren at nvidia.com>

Applied to u-boot/master, thanks!

-- 
Tom
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