On Mon, Jul 16, 2018 at 02:53:26PM +0200, Alexander Graf wrote: > On 07/14/2018 05:49 PM, Tom Rini wrote: > >On Sat, Jul 14, 2018 at 12:47:21PM +0200, Wolfgang Denk wrote: > >>Dear Felix, > >> > >>In message <[email protected]> you wrote: > >>>The motivation for writing this patch originates in the > >>>effort of synchronizing U-Boot DT to Linux DT for am33xx SOCs. > >>>The current am33xx.dtsi file from U-Boot defines the <reg-shift> > >>>property for all UART nodes. The actual (4.18+) am33xx.dtsi > >>>file from Linux does not define <reg-shift> anymore. To prevent > >>>(probably difficult) changes in many .dts and .dtsi files once > >>>the synchronization is done, one can use this new variable. For > >>>the pdu001 board, for example, SYS_NS16550_REG_SHIFT is set > >>>to 2; no need to clutter U-Boot and board specific dts files > >>>with <reg-shift> properties. > >>Does this mean that U-Boot will not be able to use the same DTB as > >>Linux? > >To be clear, it's the other way around. We can't use the Linux dtb/dts > >files as they've dropped (and in other cases, aren't adding) these > >properties as it's handled differently. > > What does "differently" mean? Linux tries quite hard to be platform > agnostic, so a per-build-target #define surely isn't what they're doing.
Yes, what exactly is the Linux kernel doing here? -- Tom
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