How to handle parameter variation across different boards but same platform

On Thursday 05 July 2012, Vaibhav Hiremath wrote:

On 7/4/2012 7:57 PM, Mark Brown wrote:

quoted

On Wed, Jul 04, 2012 at 02:17:48PM +0000, Hebbar, Gururaja wrote:

quoted

On Wed, Jul 04, 2012 at 19:31:18, Mark Brown wrote:

quoted

quoted

If these are totally different boards they should have different machine
IDs set so machine_is_() should identify.  If that isn't there then you
need to do something custom to your products to identify the boards
further.

quoted

They are different boards with same SoC (AM33xx). So they both are true for
machine_is_am33xx().

What if the device only supports Linux boot from DT, where we set
machine_desc.nr = ~0 ??

Does machine ID still gets set? May be I am missing something...

No, it doesn't.

As part of my debugging, on AM335xEVM platform machine_is_am33xx()
returns false, since the value of machine_desc.nr is set to ~0.

Correct. However, when you are booting using the device tree, parameters
such as the clock frequency of a device should be encoded in the device
tree itself, so you don't need to know which machine you are on.

	Arnd