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barebox/Documentation/timekeeping.txt

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rename U-Boot-v2 project to barebox This has been done with the following script: find -path ./.git -prune -o -type f -print0 | xargs -0 -r sed -i \ -e 's/u2boot/barebox/g' \ -e 's/U2Boot/barebox/g' \ -e 's/U-boot V2/barebox/g' \ -e 's/u-boot v2/barebox/g' \ -e 's/U-Boot V2/barebox/g' \ -e 's/U-Boot-v2/barebox/g' \ -e 's/U_BOOT/BAREBOX/g' \ -e 's/UBOOT/BAREBOX/g' \ -e 's/uboot/barebox/g' \ -e 's/u-boot/barebox/g' \ -e 's/u_boot/barebox/g' \ -e 's/U-Boot/barebox/g' \ -e 's/U-boot/barebox/g' \ -e 's/U-BOOT/barebox/g' find -path ./.git -prune -o \( -name "*u-boot*" -o -name "*uboot*" -o -name "*u_boot*" \) -print0 | \ xargs -0 -r rename 's/u[-_]?boot/barebox/' It needs some manual fixup following in the next patch Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2009-12-15 08:11:09 +00:00
------------ barebox timekeeping -------------
svn_rev_464 add Documentation
2007-07-05 16:01:56 +00:00
rename U-Boot-v2 project to barebox This has been done with the following script: find -path ./.git -prune -o -type f -print0 | xargs -0 -r sed -i \ -e 's/u2boot/barebox/g' \ -e 's/U2Boot/barebox/g' \ -e 's/U-boot V2/barebox/g' \ -e 's/u-boot v2/barebox/g' \ -e 's/U-Boot V2/barebox/g' \ -e 's/U-Boot-v2/barebox/g' \ -e 's/U_BOOT/BAREBOX/g' \ -e 's/UBOOT/BAREBOX/g' \ -e 's/uboot/barebox/g' \ -e 's/u-boot/barebox/g' \ -e 's/u_boot/barebox/g' \ -e 's/U-Boot/barebox/g' \ -e 's/U-boot/barebox/g' \ -e 's/U-BOOT/barebox/g' find -path ./.git -prune -o \( -name "*u-boot*" -o -name "*uboot*" -o -name "*u_boot*" \) -print0 | \ xargs -0 -r rename 's/u[-_]?boot/barebox/' It needs some manual fixup following in the next patch Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2009-12-15 08:11:09 +00:00
In barebox we use the clocksource mechanism from the Linux Kernel. This makes
svn_rev_464 add Documentation
2007-07-05 16:01:56 +00:00
it fairly easy to add timer functionality for a new board or architecture.
Apart from initialization there is only one function required:
clocksource_read(). This function returns the current value of a free running
counter. Other functions like udelay() and get_time_ns() are derived from this
function. The only thing you have to implement is a clocksource driver. See
cpu/arm920t/imx/interrupts.c for an example. clocksource drivers from the
Linux Kernel can be used nearly 1:1, except for the register accesses.
for clocksources the __lshrdi3 symbol is needed. You can find the function for
your architecture in the Linux Kernel or a libc of your choice.