On Wednesday, January 21, 2015 at 05:16:03 PM, Zhi Li wrote: > On Sun, Dec 28, 2014 at 4:26 AM, Stefan Wahren <stefan.wah...@i2se.com> wrote: > > According to i.MX23 and i.MX28 reference manual the fractional > > clock control registers must be addressed by byte instructions. > > I don't think mx23 and mx28 have such limitation. I will double check > with IC team about this. > RTL is generated from a xml file. All registers implement is unified. > I don't think only clock control register have such limitation and > other registers not.
Hi, Section 10.8.24 in the MX28 datasheet (Fractional Clock Control Register 0) states otherwise, but maybe the documentation is simply not matching the silicon. Here's a quote: " This register controls the 9-phase fractional clock dividers. The fractional clock frequencies are a product of the values in these registers. NOTE: This register can only be addressed by byte instructions. Addressing word or half- word are not allowed. " I also recall seeing weird behavior when these registers were accessed by word access in U-Boot, so I believe the datasheet is correct. Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/