Le 06/02/2012 20:27, Mike Frysinger a écrit :
On Monday 06 February 2012 09:49:27 Tom Rini wrote:
On Mon, Feb 6, 2012 at 1:43 AM, Graeme Russ wrote:
On 02/06/2012 06:51 PM, Wolfgang Denk wrote:
Graeme Russ wrote:
I think the immediate focus should be on centralising the init sequence
processing into /common/init.c and then bringing the new'initcall'
architecture online
Agreed.
Once these have been done, any board can just specific:
SKIP_INIT(RELOC)
I will probably object to his, too - for the same reasons.
Considering this is a 'free' artefact of how the init sequence functions,
and that it is board specific and totally non-invasive for anyone else
(i.e. no ugly ifdef's anywhere else in the code) I'm surprised you would
object...
To pick up Wolfgang's argument, but why do we want to skip relocation?
You can debug through it, it's documented (official wiki has GDB,
over in TI-land, the wiki page for CCS has the bits for doing it in
that Eclipse-based env, other debuggers I'm sure have a similar "now
add symbols at this offset from link" option) and the end result makes
it very easy for end-users to break their world (default kernel load
addrs being where U-Boot would be).
if you have a static platform which never changes, isn't the relocation a
waste of time ? i can understand wanting relocation by default for platforms
where memory sizes are unknown, but it's not uncommon for people to have fixed
hardware when they deploy.
Relocation may not be a waste of time if the static platform boots
U-Boot from NOR, as relocation will be needed to move U-Boot to RAM in
working order.
Now if the platform is static and has a preloader of sorts, then one can
predict (or just observe) where U-Boot would want to relocate, and set
the preloader once and for all (for a given release of U-Boot, that is)
to load U-Boot directly at that address. U-Boot will skip copy and
relocation if it already resides at the right address.
although, with SPL picking up direct-to-Linux booting, this argument might not
matter that much anymore.
Agreed, although one could make a point that SPL direct-to-Linux is not
the most common case currently and may not be applicable to all cases
anyway.
-mike
Amicalement,
--
Albert.
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