diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2014-10-23 16:33:33 +0100 |
|---|---|---|
| committer | Kees Cook <keescook@google.com> | 2015-10-07 13:13:02 -0700 |
| commit | b11c7dd5bcf9ad2f7a49069e606333f1c42cad6a (patch) | |
| tree | 47d03796dc0821f7ead36c214a159f20cf2b7b87 | |
| parent | 7226149fe3fee527c7f3f43a75057c930745a022 (diff) | |
UPSTREAM: efi: efi-stub: notify on DTB absence
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 <mark.rutland@arm.com>
Acked-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Roy Franz <roy.franz@linaro.org>
Acked-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
(cherry picked from commit 0bcaa9040d058684d58c36ef273b8946996c7078)
Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Bug: 24475017
Change-Id: Ia2c69ebfa0f632c43ac014312c77dafccbe02305
Signed-off-by: Kees Cook <keescook@google.com>
| -rw-r--r-- | drivers/firmware/efi/libstub/arm-stub.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c index 75ee05964cbc..eb48a1a1a576 100644 --- a/drivers/firmware/efi/libstub/arm-stub.c +++ b/drivers/firmware/efi/libstub/arm-stub.c @@ -247,9 +247,18 @@ 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, |