On 5/4/20 7:20 PM, Grant Likely wrote:
None of the relevent specs (EFI, DT, EBBR) specify the GUID for passing a DTB. Add it to the EBBR document so it is documented somewhere relevant.
Fixes: #45 Cc: Andrei Warkentin awarkentin@vmware.com Cc: Francois Ozog francois.ozog@linaro.org Signed-off-by: Grant Likely grant.likely@arm.com
source/chapter2-uefi.rst | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/source/chapter2-uefi.rst b/source/chapter2-uefi.rst index f6a5802..cf2f652 100644 --- a/source/chapter2-uefi.rst +++ b/source/chapter2-uefi.rst @@ -86,6 +86,16 @@ tables.
- An Advanced Configuration and Power Interface [ACPI]_ table, or
- a Devicetree [DTSPEC]_ system description
+A Devicetree system description MUST be provided in Flattened Devicetree (DTB) +format version 17 or higher.
It is not self-evident what format version 17 might refer to.
I would suggest :
A Devicetree system description MUST be provided in Flattened Device Tree (DTB) format version 17 (described in Devicetree Specification 0.2) or higher.
+The following GUID must be used in the EFT system table to identify the DTB.
I would not know what EFT refers to. I cannot find that term in the UEFI spec. And it is not used in EBBR version 1.0. I suggest:
The configuration table with the Flattened Devicetree is identified by the following GUID in the UEFI system table:
Best regards
Heinrich
+.. code-block:: c
- #define EFI_DTB_GUID \
EFI_GUID(0xb1b621d5, 0xf19c, 0x41a5, \0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0)As stated above, EBBR systems must not provide both ACPI and Devicetree tables at the same time. Systems that support both interfaces must provide a configuration -- 2.20.1
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