> -----Original Message----- > From: sun york-R58495 > Sent: Friday, September 27, 2013 1:19 AM > To: Sharma Bhupesh-B45370; Wood Scott-B07421; 'FengHua' > Cc: 'trini'; sun york-R58495; 'u-boot' > Subject: Re: [U-Boot] When to create a SoC directory for ARM > > On 09/26/2013 12:46 PM, Sharma Bhupesh-B45370 wrote: > > > >> -----Original Message----- > >> From: u-boot-boun...@lists.denx.de > >> [mailto:u-boot-boun...@lists.denx.de] > >> On Behalf Of Scott Wood > >> Sent: Friday, September 27, 2013 12:53 AM > >> To: FengHua > >> Cc: trini; sun york-R58495; u-boot > >> Subject: Re: [U-Boot] When to create a SoC directory for ARM > >> > >> On Thu, 2013-09-26 at 13:23 +0800, FengHua wrote: > >>>> Date: Wed, 25 Sep 2013 20:10:13 -0500 > >>>> From: Scott Wood <scottw...@freescale.com> > >>>> Subject: Re: [U-Boot] When to create a SoC directory for ARM > >>>> To: sun york-R58495 <r58...@freescale.com> > >>>> Cc: Rini <tr...@ti.com>, Wood Scott-B07421 <b07...@freescale.com>, > >>>> "u-boot@lists.denx.de" <u-boot@lists.denx.de>, Tom > >>>> Message-ID: <1380157813.24959.237.ca...@snotra.buserror.net> > >>>> Content-Type: text/plain; charset="UTF-8" > >>>> On Wed, 2013-09-25 at 20:04 -0500, sun york-R58495 wrote: > >>>>> On Sep 25, 2013, at 4:52 PM, Scott Wood wrote: > >>>>> > >>>>>> On Wed, 2013-09-25 at 16:30 -0700, York Sun wrote: > >>>>>>> Dear Wolfgang, > >>>>>>> > >>>>>>> I failed to find the guideline, here is my question. Pardon me > >>>>>>> if this is a dump question as I am still new to ARM. > >>>>>>> > >>>>>>> As David Feng post his patch set to add ARMv8 support, I am > >>>>>>> trying to enable it for Freescale implementation. Let's name it > >>>>>>> as LS2 for this discussion. I am thinking to reuse as much as > >>>>>>> possible for existing codes, which include copying some header > >>>>>>> files from powerpc partially. I noticed the SoC field in > >>>>>>> boards.cfg file and I am wondering how to use it effectively. I > >>>>>>> want to put LS2 specific headers to > >>>>>>> arch/arm/include/asm/arch-ls2. Do I need to copy all files from > >>>>>>> arch/arm/include/asm/arch-armv8/? There aren't many but I see > >>>>>>> mmu.h is included in start.S. I have been searching case like > >> this in ARMv7 but didn't see shared header file (maybe I missed it). > >> Please advise. > >>>>>> > >>>>>> LS2 is (or perhaps more accurately, contains) an implementation > >>>>>> of ARMv8, so you should be using arch-armv8 rather than copying > >> it. > >>>>> > >>>>> True. But I guess LS2 won't be the only "LS" Freescale is going to > >>>>> make. Where is the best place to put the header file for chassis > >>>>> related registers, like CCSR we have for mpc8xxx. > >>>> Anything that isn't deeply tied to the ARM architecture should > >>>> probably just go in include/. > >>>>> I am thinking the > >>>>> best place is arch/arm/include/asm/ls2 (or a better name). Like > >>>>> other > >>>>> ARMv7 variants, I am thinking to put ls2 under arch/arm/cpu/armv8/ > >>>>> as well, to host LS-specific code. > >>> > >>>> Likewise, if it's specifically tied to armv8 it should go in > >>>> arch/arm/include/asm/arch-armv8, but I'm not sure what would be > >>>> tied to both armv8 and ls2. Most likely anything LS-specific that > >>>> needs to go under arch/arm/ should go somewhere like > >>>> arch/arm/include/asm/ls/ (similar to arch/arm/include/asm/imx- > >> common). > >>> > >>>> -Scott > >>> all SOC specific include file should be in > >>> arch/arm/include/asm/arch-SOC/ or some common directory(like > >>> include/asm/imx-common). Currently, u-boot only link SOC > >>> specific(arch-SOC) include directory. > >>> You could touch a mmu.h file in arch/arm/include/asm/arch-ls2/ and > >>> include arch/arm/include/asm/arch-armv8/mmu.h. > >>> or move arch-armv8/mmu.h to arch/arm/include/asm/ to make it as a > >>> generic file. > >>> Maybe we should distinguish architecture specific include directory > >>> and SOC specific include directory. > >> > >> Is the XXX arch-XXX supposed to be an SoC family or a CPU > >> family/architectutre? > >> > > > > Usually in 'arch/arm/include/asm' we have both: > > - arch-armv7 (Arch specific. Houses stuff common to ARMv7 CPU, e.g. > > Global timer, SP805 WDT..) > > - arch-mx6 (SoC family specific. Houses stuff like SoC specific IOMUX > > pads..) > > > > We should have something similar for LayerScape. > > > > > If you look closely, you will find arch-armv7 and its sub-arch including > am33xx, at91, exynos, etc. >
I cannot find any sub-arch inside 'arch/arm/include/asm/arch-armv7' (I am referring to reference [1]) I think you are talking about 'arch/arm/cpu/arch-armv7'. That's not what I was referring to my original mail. I believe David was mentioning the same in his mail (mmu.h inside 'arch/arm/include/asm/arch-armv8') . References: [1] http://git.denx.de/?p=u-boot.git;a=tree;f=arch/arm/include/asm/arch-armv7;h=cc9d1ccedcba6881922b12ae8377627cb8632c46;hb=HEAD Regards, Bhupesh _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
