On Thu, Nov 15, 2012 at 1:25 PM, Arnd Bergmann <a...@arndb.de> wrote: > On Thursday 15 November 2012, Lee Jones wrote: >> >> > > +/* for automatic boot timing testcases */ >> > > +#define ATAG_BOOTTIME 0x41000403 >> > Where can I refer this ATAG usage? can you point out the reference URL >> > or patches? >> >> I assumed this would be in Mainline u-boot, but apparently not. >> On closer inspection of the internal ST-Ericsson u-boot, this >> functionality appears to be provided by patches which currently >> exist as delta. So in essence, the bootloader you use will have >> to be patched in a similar way for you to retrieve information >> surrounding bootloader boot times. >> >> And there was me thinking it was magic. ;) >> > > And since we're moving away from ATAG on ux500 towards DT, it won't > even work in the future. How essential is this part for the operation > of your code?
To be fun we need some mechanism to pass this info from the boot loader to the kernel. I think most bootloaders are already dynamically altering their device trees to put in things like memory size etc so this would probably be done the same way: a standard binding like for everything else, then put the data in there. I don't know if Lee has a modifiable U-boot to try out such concepts on though? Yours, Linus Walleij -- 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/
