Subject: [PATCH v2 10/10] efi: efi-stub: notify on DTB absence

From: [email-masked] (Matt Fleming)
Date: Tue, 4 Nov 2014 17:42:21 +0000

On Tue, 28 Oct, at 05:18:43PM, Ard Biesheuvel wrote:
> From: Mark Rutland <[email-masked]>
> 
> In the absence of a DTB configuration table, the EFI stub will happily
> continue attempting to boot a kernel, despite the fact that this kernel
> may not function without a description of the hardware. In this case, as
> with a typo'd "dtb=" option (e.g. "dbt=") or many other possible
> failures, the only output seen by the user will be the rather terse
> output from the EFI stub:
> 
> EFI stub: Booting Linux Kernel...
> 
> To aid those attempting to debug such failures, this patch adds a notice
> when no DTB is found, making the output more helpful:
> 
> EFI stub: Booting Linux Kernel...
> EFI stub: Generating empty DTB
> 
> Additionally, a positive acknowledgement is added when a user-specified
> DTB is in use:
> 
> EFI stub: Booting Linux Kernel...
> EFI stub: Using DTB from command line
> 
> Similarly, a positive acknowledgement is added when a DTB from a
> configuration table is in use:
> 
> EFI stub: Booting Linux Kernel...
> EFI stub: Using DTB from configuration table
> 
> Signed-off-by: Mark Rutland <[email-masked]>
> Acked-by: Leif Lindholm <[email-masked]>
> Acked-by: Ard Biesheuvel <[email-masked]>
> Cc: Mark Salter <[email-masked]>
> Cc: Matt Fleming <[email-masked]>
> Acked-by: Roy Franz <[email-masked]>
> Signed-off-by: Ard Biesheuvel <[email-masked]>
> ---
>  drivers/firmware/efi/libstub/arm-stub.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)

Can't really argue with this.

Acked-by: Matt Fleming <[email-masked]>

-- 
Matt Fleming, Intel Open Source Technology Center