Russell McGuire wrote: > Isn't default behavior that these fields are kept from the <BIOS> U-boot > during boot, if a zero is present? Is there any advantage to resetting them > within the dts file during linux boot up?
Depending on which version of U-Boot, a given property may or may not be initialized by U-Boot. The problem is that as new properties are defined, U-Boot is not always updated to initialize that property, and sometimes it's only updated on some CPU families. The qe/brg-frequency property is a good example. Prior to U-Boot 1.3, it was not being initialized at all. With U-Boot 1.3, it's only initialized on 83xx, even though some 85xx boards have a QE. I have a QE UART driver that looks at qe/brg-frequency, and if it's non-zero, I use it. If it is zero, then I take the qe/bus-frequency property and divide it in half. -- Timur Tabi Linux kernel developer at Freescale _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
