[yocto] [meta-raspberrypi][PATCH v3] u-boot: Simplify boot script

Paul Barker paul at paulbarker.me.uk
Sun Nov 6 03:57:24 PST 2016

On Sat,  5 Nov 2016 12:50:07 +1100
Jonathan Liu <net147 at gmail.com> wrote:

> A patch is added to check if the firmware loaded a device tree blob
> into memory and set the fdt_addr_r variable if it is found. The U-Boot
> script will then read the command line arguments generated by the
> firmware from the device tree and boot the kernel with the command
> line arguments and the loaded device tree.
> This allows things like MAC address, board revision and serial number
> to be correctly configured and options in config.txt to be used.
> Signed-off-by: Jonathan Liu <net147 at gmail.com>
> ---
> Changes in v3:
>  - Removed incorrect check if fdt_addr_r is already set. The check
>    condition was inverted and fdt_addr_r variable is always set to
>    0x100 by default.
> Changes in v2:
>  - Instead of setting device_tree_address to 0x100 in config.txt, patch
>    U-Boot to detect the device tree blob address if it was loaded.

I'm still getting the same "Could not find a valid device tree" failure
on the model B+.

I've tried running vcdbg but got the following error from the kernel

    vc_mem_mmap: length 4096 is too big

vcdbg itself then said:

    debug_sym: AccessVideoCoreMemory: mmap failed: Invalid argument(22)
    debug_sym: OpenVideoCoreMemoryFileWithOffset: ReadVideoCoreMemory @VC_SYMBOL_BASE_OFFSET (0x00002800) failed

    Unable to open videocore memory access: -5

This was after adding "dtdebug=on" to config.txt

Not sure where to go next with this. I might need to go off on a Yak
shaving mission and find out why the mmap is failing.


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