On 12/17/2012 03:37 PM, Wolfgang Denk wrote: > Dear Stephen Warren, > > In message <50cf9baa.3050...@wwwdotorg.org> you wrote: >> >> There are many ways besides device tree to enumerate hardware. For >> example, consider PCI or USB (albeit USB isn't memory mapped). I don't > > Yes, there are. But your console port cannot be compred against > dynamically populated and scannable bus interfaces like USB or PCI, > and I think you are aware of that.
I honestly don't know why you couldn't have a PCI-based console UART. >> think we should tie any new U-Boot dynamic device registration API to >> device tree, since that would seem to prevent (or imply against) usage >> of that API with PCI for example. > > Not any dynamic device registration. But here, it actually AIN'T > dynamic - it is fully static, just board dependent. If you want to run the same U-Boot binary on multiple different boards, then that does make the UART selection dynamic. There's no conceptual difference between dynamic information coming from a DT passed to U-Boot at runtime, SoC-defined enumeration/selection mechanisms such as Tegra's ODMDATA, or scanning a PCI bus. Or, is U-Boot going to ban addressing TI's case where the UART selection is stored in an I2C EEPROM that can be read at run-time, since instead during flashing that information could be extracted and hard-coded into the board's device tree instead? _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
