Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753637AbaJWS7q (ORCPT ); Thu, 23 Oct 2014 14:59:46 -0400 Received: from mail-vc0-f170.google.com ([209.85.220.170]:36904 "EHLO mail-vc0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752109AbaJWS7o (ORCPT ); Thu, 23 Oct 2014 14:59:44 -0400 MIME-Version: 1.0 In-Reply-To: <1414078413-15439-1-git-send-email-mark.rutland@arm.com> References: <1414078413-15439-1-git-send-email-mark.rutland@arm.com> Date: Thu, 23 Oct 2014 11:59:43 -0700 Message-ID: Subject: Re: [PATCHv2] efi: efi-stub: notify on DTB absence From: Roy Franz To: Mark Rutland Cc: "linux-arm-kernel@lists.infradead.org" , Linux Kernel Mailing List , Leif Lindholm , Ard Biesheuvel , Mark Salter , Matt Fleming Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 23, 2014 at 8:33 AM, Mark Rutland wrote: > Since v1 [1]: > * Add a positive acknowledgement for a configuration table DTB > * Fixed a couple of typos in the commit message > > Ard, Leif, Roy, I've assumed your acks from v1 are still valid with the > additional print. Please shout if that's not the case. > > Thanks, > Mark. > > [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/295521.html > > ---->8---- > 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 > Acked-by: Leif Lindholm > Acked-by: Ard Biesheuvel > Cc: Mark Salter > Cc: Matt Fleming > Acked-by: Roy Franz > --- > drivers/firmware/efi/libstub/arm-stub.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c > index 480339b..21fa50e 100644 > --- a/drivers/firmware/efi/libstub/arm-stub.c > +++ b/drivers/firmware/efi/libstub/arm-stub.c > @@ -243,9 +243,18 @@ unsigned long __init efi_entry(void *handle, efi_system_table_t *sys_table, > goto fail_free_cmdline; > } > } > - if (!fdt_addr) > + > + if (fdt_addr) { > + pr_efi(sys_table, "Using DTB from command line\n"); > + } else { > /* Look for a device tree configuration table entry. */ > fdt_addr = (uintptr_t)get_fdt(sys_table); > + if (fdt_addr) > + pr_efi(sys_table, "Using DTB from configuration table\n"); > + } > + > + if (!fdt_addr) > + pr_efi(sys_table, "Generating empty DTB\n"); > > status = handle_cmdline_files(sys_table, image, cmdline_ptr, > "initrd=", dram_base + SZ_512M, > -- > 1.9.1 > Acked-by: Roy Franz -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/