Dear Kyle Moffett, In message <1298311199-18775-5-git-send-email-kyle.d.moff...@boeing.com> you wrote: > The current FreeScale MPC-8xxx DDR SPD interpreter is using full 64-bit > integer divide operations to convert between nanoseconds and DDR clock > cycles given arbitrary DDR clock frequencies. > > Since all of the inputs to this are 32-bit (nanoseconds, clock cycles, > and DDR frequencies), we can easily restructure the computation to use > the "do_div()" function to perform 64-bit/32-bit divide operations. > > This decreases compute time rather significantly for each conversion and > avoids bringing in a very complicated function from libgcc. > > It should be noted that nothing else in U-Boot or the Linux kernel seems > to require a full 64-bit divide on any 32-bit PowerPC. > > Build-and-boot-tested on the HWW-1U-1A board using DDR2 SPD detection. > > Signed-off-by: Kyle Moffett <kyle.d.moff...@boeing.com> > --- > > Author's note: This patch really needs a bunch more review and testing, but > I only have access to a very limited selection of hardware. Please let me > know about any questions or concerns.
This patch should be split off the patch series and submitted separately. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de "A witty saying proves nothing." - Voltaire _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
