[PATCH] PowerPC 440EPx/GRx fix memory size calculation

[Josh Boyer]

On Thu, Mar 12, 2009 at 09:24:13AM +0100, Stefan Roese wrote:
>On Thursday 12 March 2009, Benjamin Herrenschmidt wrote:
>> On Thu, 2009-03-12 at 09:05 +0100, Stefan Roese wrote:
>> > Both is possible. Older U-Boot versions only passed the bd_t struct to
>> > the kernel. For those U-Boot's the wrapper is needed. More recent U-Boot
>> > versions support passing a device-tree blob to the kernel. U-Boot patches
>> > the correct memory size in this blob.
>> >
>> > As a matter of fact, I never used the wrapper before. U-Boot supports
>> > passing the device-tree blob to Linux since quite some time now.
>>
>> Yes, that's also how I use it on canyonlands... now, the wrapper could
>> probably be used to look at the bd_t anyways, no ?
>
>Sure.

Do newer U-Boot versions pass both the dtb and the bd_t?  If not, the wrapper
would have to look for one, then the other and not get confused.

>> Either get the mem 
>> size from there or some flag or version in there can indicate if it's
>> been "fixed".
>
>I don't think that we have some flag and/or version information in the bd_info 
>struct. And extending this struct doesn't sound like a good idea to me.

Yeah, we've already had some issues pop up in the past where the bd_t wasn't
correct for a board in the U-Boot version that shipped with it (like the acadia
boards).  There's not much that can be done to fix it.

josh