Hi Albert, On Sun, 7 Oct 2012 19:19:37 +0200, Albert ARIBAUD <albert.u.b...@aribaud.net> wrote:
> Hi Jeroen, > > On Sun, 07 Oct 2012 17:18:27 +0200, Jeroen Hofstee > <dasub...@myspectrum.nl> wrote: > > > Hello All, > > > > On 10/07/2012 01:34 PM, Enric Balletbò i Serra wrote: > > > Hi Albert, > > > > > > 2012/10/5 Albert ARIBAUD <albert.u.b...@aribaud.net>: > > >> Hi Tetsuyuki, > > >> > > >> On Fri, 5 Oct 2012 13:39:22 +0900, Tetsuyuki Kobayashi > > >> <k...@kmckk.co.jp> wrote: > > >> > > >>> lowlevel_init() of rmobile badly assumed that ip register holds return > > >>> address. > > >>> The commit "63ee53a7 armv7 cpu_init_crit: Simplify code" breaks this > > >>> assumption. > > >>> This patch removes this bad assumption and simplify code. > > >>> > > >>> Signed-off-by: Tetsuyuki Kobayashi <k...@kmckk.co.jp> > > >>> --- > > >>> > > >> ... > > > Note that the patch that Tetsuyuki says also breaks SPL support for > > > OMAP3 boards, at least my IGEP boards doesn't boot and hangs at SPL > > > level. > > > > > > U-Boot SPL 2012.10-rc1-00244-g28e5ac2 (Oct 07 2012 - 13:11:29) > > > > > > Bisecting the problem I encountered the problem is the commit > > > "63ee53a7 armv7 cpu_init_crit: Simplify code". > > > > > > Cheers, > > > Enric > > > > > I can confirm above. Also the tam3517 som (omap3) fails to boot due to > > mentioned commit. The patch from Tetsuyuki is arch specific (rmobile) so > > that won't fix the omap case. Reverting the patch, 63ee53a, does help. > > > > Is there anything against reverting the patch (at least for the release...)? > > Here is my opinion: > > 1) I think patch 63ee53a7 is right in considering there is no need for > cpu_init_crit to save lr in ip before calling lowlevel_init especially > considering this is a tail call. > > Only lowlevel_init can tell if it uses ip or lr for its own purposes, > thus any saving of ip and/or lr due to the workings of lowlevel_init > should be performed in lowlevel_init. > > 2) I am not sure that the patch in this discussion depends on 63ee53a7, > because IIUC, the patch simply saves ip "on a stack" then lr into ip, > and after running s_init, restores from ip and ip from the stack; it > never assumes ip contains a return address. > > I know we're that close to the release, but I want to be sure we > understand what needs fixing. Kobayashi, Jeroen, can you indicate > precisely how the issues you encounter are related to 63ee53a7? (adding back Tetsuyuki's mail in the Cc: list -- why had it disappeared?) > > Regards, > > Jeroen > > Amicalement, Amicalement, -- Albert. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
