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From: Warner Losh <imp@FreeBSD.org>
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Subject: PERFORCE change 112700 for review
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http://perforce.freebsd.org/chv.cgi?CH=112700

Change 112700 by imp@imp_lighthouse on 2007/01/10 06:56:33

	MF FreeBSD-tsc-6: slow down spi bus enough to make the dataflash
	parts reliable on read.  MCK / 2 is too fast.  I think MCK / 4
	would work too, but MCK / 20 was rock solid.
	
	I think this works in the boot loader because we're running with
	the caches off, slowing things down, but I am actually a bit
	baffled.  Maybe I just have a bad board...

Affected files ...

.. //depot/projects/arm/src/sys/arm/at91/at91_spi.c#16 edit

Differences ...

==== //depot/projects/arm/src/sys/arm/at91/at91_spi.c#16 (text+ko) ====

@@ -115,7 +115,7 @@
 	WR4(sc, SPI_MR, (0xf << 24) | SPI_MR_MSTR | SPI_MR_MODFDIS |
 	    (0xE << 16));
 
-	WR4(sc, SPI_CSR0, SPI_CSR_CPOL | (4 << 16) | (2 << 8));
+	WR4(sc, SPI_CSR0, SPI_CSR_CPOL | (4 << 16) | (20 << 8));
 	WR4(sc, SPI_CR, SPI_CR_SPIEN);
 
 	WR4(sc, PDC_PTCR, PDC_PTCR_TXTDIS);