Hello Vikas, On Mon, 18 Jan 2016 18:52:57 -0800, Vikas Manocha <vikas.mano...@st.com> wrote: > BIC instruction to clear the SP is not allowed in armv7m & is deprecated > in ARMv6T2 & above. This patch cleans the code by using instructions allowed > for armv7m as well as other Arm archs.
I am not against this patch, which has merits on its own; but the commit message above raises a couple of questions. 1. It seems to imply that in the current arch/arm/lib/crt0.S, BIC is incorrectly being used on sp. However, it is *not*; it is used on r3, precisely because it cannot be used directly on sp, as the comment before the bic instruction clearly states. Why does the commit message raise this non-issue? 2. I could not find any information on BIC being deprecated in Architecture Reference Manuals of either ArmV7 (section "Deprecated Features in ARMv7-M", or ARMv6-M (section "Deprecated and Obsolete Features"). Where does this information come from? Amicalement, -- Albert. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
