[PATCH 3/5] omap: Add support for CONFIG_AUTO_ZRELADDR for DEBUG_LL

* Nicolas Pitre [off-list ref] [110204 12:14]:

Just create a get_config_ptr macro or similar and the trickery will be 
nicely encapsulated.  You'd have:

	.macro get_config_ptr ptr, tmp
	b	9002f
	.align
9001:	.long	.
	.long	uart_param_storage
9002:	adr	\ptr, 9001b
	ldr	\tmp, [\ptr]
	sub	\tmp, \tmp, \ptr
	ldr	\ptr, [\ptr, #4]
	sub	\ptr, \ptr, \tmp
	.endm

	.macro addruart rp, rv
	get_config_ptr \rv
	ldr	\rp, [\rv]
	ldr	\rv, [\rv, #4]
	.endm

And for the other macros, you get the hardware address to use already, 
but you can still use get_config_ptr for extra config values you 
need if necessary.

Thanks, will try that out next week. That might run into problems with
busyuart as it only has rd register to play with.
 

quoted

In that case the mapping of IO space for the serial port in head.S
would have to be changed as that relies on rx containing the port
IO address..

Yes, and I'm not sure if it is worth changing that at this point when it 
is possible to do it without introducing such a change which would 
affect all machines again.

Agreed, let's see how far we can get with the existing setup.

What might need to be done is to save and restore rx in
busyuart to be able to use your macro above.

Tony