PLL & clock settings on GTA02: u-boot vs. qi

[Andy Green]

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Somebody in the thread at some point said:

| It sounds great if you want to meddle with this.  One hidden possibility
| you might not be aware of is that the CPU is actually 500MHz-capable
| according to the datasheet, I think the part codes claim 533MHz.

Little bit more on this in case you're lacking the datasheet... you need
to crank the CPU core LDO DOWN1 to 1.7V according to the datasheet to
get "around 500MHz".  So it would be (in src/cpu/s3c2442/gta02.c)

- -	{ PCF50633_REG_DOWN1OUT,	0x1b }, /* 1.3V (0x1b * .025V + 0.625V) */

+       { PCF50633_REG_DOWN1OUT,	43 }, /* 1.7V (43 * .025V + 0.625V) */

It's this that really hurts it on power consumption.

Another idea, the memory voltage of nominal 1.8V generated by DOWN2 can
be cranked to max 1.95V, this may help go past 100MHz.

It'd be very cool if it was possible to overclock the thing.

- -Andy
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