[PATCHv2] powerpc: Describe memory-mapped RAM&ROM chips OF bindings
Grant Likely
grant.likely at secretlab.ca
Tue Apr 1 09:16:01 EDT 2008
On Mon, Mar 31, 2008 at 10:39 AM, Laurent Pinchart
<laurentp at cse-semaphore.com> wrote:
>
> Signed-off-by: Laurent Pinchart <laurentp at cse-semaphore.com>
> ---
> Documentation/powerpc/booting-without-of.txt | 13 ++++++++++++-
> 1 files changed, 12 insertions(+), 1 deletions(-)
>
> diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
> index 7b4e8a7..3e1963b 100644
> --- a/Documentation/powerpc/booting-without-of.txt
> +++ b/Documentation/powerpc/booting-without-of.txt
> @@ -57,7 +57,8 @@ Table of Contents
> n) 4xx/Axon EMAC ethernet nodes
> o) Xilinx IP cores
> p) Freescale Synchronous Serial Interface
> - q) USB EHCI controllers
> + q) USB EHCI controllers
> + r) Memory-mapped RAM & ROM
>
> VII - Specifying interrupt information for devices
> 1) interrupts property
> @@ -2816,6 +2817,16 @@ platforms are moved over to use the flattened-device-tree model.
> big-endian;
> };
>
> + r) Memory-mapped RAM & ROM
> +
> + Dedicated RAM and ROM chips are often used as storage for temporary or
> + permanent data in embedded devices. Possible usage include non-volatile
> + storage in battery-backed SRAM, semi-permanent storage in dedicated SRAM
> + to preserve data accross reboots and firmware storage in dedicated ROM.
> +
> + - name : should be either "ram" or "rom"
> + - reg : Address range of the RAM/ROM chip
> +
No compatible prop? How does the OS know what the node is to be used for?
Cheers,
g.
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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