[Skiboot] [PATCH] head.S: document opal_naca

[Stewart Smith]

Oliver O'Halloran <oohall at gmail.com> writes:
> On P7 machines OPAL can be loaded as a replacement for PHYP or in an
> OPAL specific mode. In OPAL mode 0x0 contains a pointer to the OPAL
> specific variant of the NACA which defines the entrypoint to OPAL, etc.
> Later machines use the same load method for for PHYP and OPAL and do not
> need the OPAL specific NACA, but this needs to be kept around for backwards
> compatibility.
>
> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
> ---
>  asm/head.S | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)

Thanks! merged to master as of c6a6391892539450a84d3dd69f4d83ea1a1b04d6

-- 
Stewart Smith
OPAL Architect, IBM.