[U-Boot] 83xx and LCRR setting

[Heiko Schocher]

Hello Kim,

Kim Phillips wrote:
> On Thu, 20 Aug 2009 13:03:09 +0200
> Detlev Zundel <dzu at denx.de> wrote:
> 
>> or maybe even always use the mask, define it in the board config and do
>> a
>>
>> #if !defined(LCCR_MASK)
>> #define LCCR_MASK 0xFFFFFFFF
>> #endif
> 
> ack.

nack, it should be

#if !defined(LCCR_MASK)
#define LCCR_MASK 0x00000000
#endif

because I did:

+#if defined(CONFIG_MPC832x)
+	/* LCRR - Clock Ratio Register (10.3.1.14) */
+	im->lbus.lcrr = (im->lbus.lcrr & LCRR_MASK) | \
+			(CONFIG_SYS_LCRR & ~LCRR_MASK);
+#else

but I can do of course a:

+	/* LCRR - Clock Ratio Register (10.3.1.14) */
+	im->lbus.lcrr = (im->lbus.lcrr & ~LCRR_MASK) | \
+			(CONFIG_SYS_LCRR & LCRR_MASK);

Which way is prefered?

But I am not sure if this is necessary, I prefer here the conditional
in code, because, if I port a new board to u-boot, I immidiately
see, there is something special, if I have an 832x ... and this
construct is not so ugly I think ...

>> This really depends if and how this applies to the other members of the
>> 83xx family.
> 
> they're all the same, really.

OK, if it is so ;-)

>> And, by the way, we should _really_ be using accessor macros all around
>> ;)
> 
> actually LCRR itself has specific instructions that say if written, it
> then should be read, and then an isync be issued.

Hmm.. actual code did not this! Where is this documented? And shouldn;t
we update this in code?

bye
Heiko
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