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It appears that blue disk leds are not blinking in mainline kernels (tried 2.6.26). To fix that, you'll need to change GPIO setting in drivers/ata/sata_mv.c:

static void mv6_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio)
{
#if 0 
	writel(0x00000060, mmio + MV_GPIO_PORT_CTL_OFS);
#else 
	writel(0x00000050, mmio + MV_GPIO_PORT_CTL_OFS);
#endif
}