lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 19 Feb 2013 15:39:32 +0530 From: Santosh Shilimkar <santosh.shilimkar@...com> To: Afzal Mohammed <afzal@...com> CC: <linux-omap@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Russell King <linux@....linux.org.uk>, Tony Lindgren <tony@...mide.com>, Marc Zyngier <marc.zyngier@....com>, Nicolas Pitre <nico@...aro.org>, Will Deacon <will.deacon@....com>, Linus Walleij <linus.walleij@...aro.org>, Rob Herring <rob.herring@...xeda.com>, Grant Likely <grant.likely@...retlab.ca>, Rob Landley <rob@...dley.net>, Sekhar Nori <nsekhar@...com>, Syed Mohammed Khasim <khasim@...com> Subject: Re: [PATCH, RFC 0/8] ARM: AM43 (OMAP2+) boot support On Monday 18 February 2013 05:05 PM, Afzal Mohammed wrote: > (Resending, since it seems, LAKML doesn't accept patches with subject > prefix only as "RFC", but requires "PATCH" prefix also) > > Hi, > > This series adds minimal support to boot Linux on platforms having > AM43 based SoC's. > > This is being sent as an RFC to seek opinion about modification in > twd to register percpu local timer clock event for scheduler tick in > the case of one core SMP. > > AM43 SoC's are based on ARM Cortex-A9. It is an ARM Cortex-A9 SMP > configuration with one core (not uniprocessor configuration). AM43 is > similar to AM335x in it's peripheral capabilities, with many of the > peripheral register mapping's similar like that of uart. > After looking at the specs, you don't need the SMP mode since ACP isn't being used. > AM43 is in pre-silicon stage and currently there are no public > documents. > > This series has been tested on a pre-silicon platform that emulates > AM43 SoC, changes proposed here are minimal - to get it booting. > Kernel was directly run without the help of bootloader - Images were > directly loaded onto a pre-initialized RAM and ARM registers updated > as required for booting. > > Changes have been made over linux-next (next-20130213) with three "OF" > related reverts (which otherwise causes problem in other platforms > also) and compiled with omap2plus_defconfig. Multiplatform option was > enabled, while most of CONFIG options were deselected for a faster > boot. Beagle bone boots as earlier with these changes. > > An interesting observation is that it may be possible to boot this > platform to console without any platform specific modification to > proper Kernel (by that I mean excluding DT sources) using Arnd's, > > "[PATCH,RFC] default machine descriptor for multiplatform", > > along with a "CLOCKSOURCE_OF_DECLARE" for smp twd. > TWD use for AM437x is also limited because these times stops in low power sates and there you will need broad-cast mechanism which again more of SMP machine feature. So I suggest to use the wakeup timer(GPT1) clock-event instead of local timer for the mentioned reason. Regards, Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists