* question about ARM11MP cpu architecture identification
@ 2010-01-12 16:21 saeed bishara
2010-01-12 16:26 ` Catalin Marinas
2010-01-12 16:34 ` Russell King - ARM Linux
0 siblings, 2 replies; 14+ messages in thread
From: saeed bishara @ 2010-01-12 16:21 UTC (permalink / raw)
To: linux-arm-kernel
Hi,
The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to
the http://infocenter.arm.com, its Main ID register is 0x410FB024, and
the MMFR[3:0] is 3. but it looks to me that the cpu_architecture()
will identify it as ARMv7, and if the kernel was configured with
CPU_V7 only, then the lookup_processor_type() function also will
identify it as ARMv7. Am I missing something here?
saeed
^ permalink raw reply [flat|nested] 14+ messages in thread* question about ARM11MP cpu architecture identification 2010-01-12 16:21 question about ARM11MP cpu architecture identification saeed bishara @ 2010-01-12 16:26 ` Catalin Marinas 2010-01-12 16:42 ` Russell King - ARM Linux 2010-01-12 16:50 ` saeed bishara 2010-01-12 16:34 ` Russell King - ARM Linux 1 sibling, 2 replies; 14+ messages in thread From: Catalin Marinas @ 2010-01-12 16:26 UTC (permalink / raw) To: linux-arm-kernel On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: > The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > will identify it as ARMv7, and if the kernel was configured with > CPU_V7 only, then the lookup_processor_type() function also will > identify it as ARMv7. Am I missing something here? cpu_architecture() returns the architecture version of the supported MMU which on ARM11MPCore is the same as on ARMv7. Even if it is possible to configure both v6 and v7 in the same kernel, I don't think it is currently possible to successfully run such kernel. -- Catalin ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 16:26 ` Catalin Marinas @ 2010-01-12 16:42 ` Russell King - ARM Linux 2010-01-12 16:55 ` Catalin Marinas 2010-01-12 16:50 ` saeed bishara 1 sibling, 1 reply; 14+ messages in thread From: Russell King - ARM Linux @ 2010-01-12 16:42 UTC (permalink / raw) To: linux-arm-kernel On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: > > The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > > will identify it as ARMv7, and if the kernel was configured with > > CPU_V7 only, then the lookup_processor_type() function also will > > identify it as ARMv7. Am I missing something here? > > cpu_architecture() returns the architecture version of the supported MMU > which on ARM11MPCore is the same as on ARMv7. > > Even if it is possible to configure both v6 and v7 in the same kernel, I > don't think it is currently possible to successfully run such kernel. What makes you think that? I've been building v6+v7 kernels for Realview (with a patch to provide the right build options for the ARMv7 arch/arm/mm files) and ISTR it works fine on my Realview board. ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 16:42 ` Russell King - ARM Linux @ 2010-01-12 16:55 ` Catalin Marinas 2010-01-12 17:03 ` saeed bishara 2010-01-12 17:06 ` Russell King - ARM Linux 0 siblings, 2 replies; 14+ messages in thread From: Catalin Marinas @ 2010-01-12 16:55 UTC (permalink / raw) To: linux-arm-kernel On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote: > On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: > > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: > > > The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > > > will identify it as ARMv7, and if the kernel was configured with > > > CPU_V7 only, then the lookup_processor_type() function also will > > > identify it as ARMv7. Am I missing something here? > > > > cpu_architecture() returns the architecture version of the supported MMU > > which on ARM11MPCore is the same as on ARMv7. > > > > Even if it is possible to configure both v6 and v7 in the same kernel, I > > don't think it is currently possible to successfully run such kernel. > > What makes you think that? I've been building v6+v7 kernels for Realview > (with a patch to provide the right build options for the ARMv7 arch/arm/mm > files) and ISTR it works fine on my Realview board. I don't remember exactly but it didn't work for me some time ago. I think it failed to build (though I could have worked around this with something like -march=all). If you have a clean patch, please push it upstream. -- Catalin ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 16:55 ` Catalin Marinas @ 2010-01-12 17:03 ` saeed bishara 2010-01-12 17:17 ` Russell King - ARM Linux 2010-01-12 17:06 ` Russell King - ARM Linux 1 sibling, 1 reply; 14+ messages in thread From: saeed bishara @ 2010-01-12 17:03 UTC (permalink / raw) To: linux-arm-kernel On Tue, Jan 12, 2010 at 6:55 PM, Catalin Marinas <catalin.marinas@arm.com> wrote: > On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote: >> On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: >> > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: >> > > ? ? The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to >> > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and >> > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() >> > > will identify it as ARMv7, and if the kernel was configured with >> > > CPU_V7 only, then the lookup_processor_type() function also will >> > > identify it as ARMv7. Am I missing something here? >> > >> > cpu_architecture() returns the architecture version of the supported MMU >> > which on ARM11MPCore is the same as on ARMv7. >> > >> > Even if it is possible to configure both v6 and v7 in the same kernel, I >> > don't think it is currently possible to successfully run such kernel. >> >> What makes you think that? ?I've been building v6+v7 kernels for Realview >> (with a patch to provide the right build options for the ARMv7 arch/arm/mm >> files) and ISTR it works fine on my Realview board. > > I don't remember exactly but it didn't work for me some time ago. I > think it failed to build (though I could have worked around this with > something like -march=all). > I think you need the attached patch from Lennert (it was planned to be sent later by me) saeed -------------- next part -------------- A non-text attachment was scrubbed... Name: 0002-ARM-allow-building-a-hybrid-ARMv6-ARMv7-kernel-imag.patch.bz2 Type: application/x-bzip2 Size: 1303 bytes Desc: not available URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100112/d6a5635e/attachment.bz2> ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 17:03 ` saeed bishara @ 2010-01-12 17:17 ` Russell King - ARM Linux 2010-01-12 17:24 ` Russell King - ARM Linux 0 siblings, 1 reply; 14+ messages in thread From: Russell King - ARM Linux @ 2010-01-12 17:17 UTC (permalink / raw) To: linux-arm-kernel On Tue, Jan 12, 2010 at 07:03:35PM +0200, saeed bishara wrote: > On Tue, Jan 12, 2010 at 6:55 PM, Catalin Marinas > <catalin.marinas@arm.com> wrote: > > On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote: > >> On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: > >> > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: > >> > > ? ? The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > >> > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > >> > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > >> > > will identify it as ARMv7, and if the kernel was configured with > >> > > CPU_V7 only, then the lookup_processor_type() function also will > >> > > identify it as ARMv7. Am I missing something here? > >> > > >> > cpu_architecture() returns the architecture version of the supported MMU > >> > which on ARM11MPCore is the same as on ARMv7. > >> > > >> > Even if it is possible to configure both v6 and v7 in the same kernel, I > >> > don't think it is currently possible to successfully run such kernel. > >> > >> What makes you think that? ?I've been building v6+v7 kernels for Realview > >> (with a patch to provide the right build options for the ARMv7 arch/arm/mm > >> files) and ISTR it works fine on my Realview board. > > > > I don't remember exactly but it didn't work for me some time ago. I > > think it failed to build (though I could have worked around this with > > something like -march=all). > > > I think you need the attached patch from Lennert (it was planned to be > sent later by me) Using -Wa,-march= for assembler options is actually a better idea. I'll update my patch with that (which actually reflects what I did for Integrator/CP with ARM926 + v6). ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 17:17 ` Russell King - ARM Linux @ 2010-01-12 17:24 ` Russell King - ARM Linux 2010-01-12 18:01 ` Catalin Marinas 2010-01-12 19:55 ` Nicolas Pitre 0 siblings, 2 replies; 14+ messages in thread From: Russell King - ARM Linux @ 2010-01-12 17:24 UTC (permalink / raw) To: linux-arm-kernel On Tue, Jan 12, 2010 at 05:17:33PM +0000, Russell King - ARM Linux wrote: > On Tue, Jan 12, 2010 at 07:03:35PM +0200, saeed bishara wrote: > > On Tue, Jan 12, 2010 at 6:55 PM, Catalin Marinas > > <catalin.marinas@arm.com> wrote: > > > On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote: > > >> On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: > > >> > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: > > >> > > ? ? The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > > >> > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > > >> > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > > >> > > will identify it as ARMv7, and if the kernel was configured with > > >> > > CPU_V7 only, then the lookup_processor_type() function also will > > >> > > identify it as ARMv7. Am I missing something here? > > >> > > > >> > cpu_architecture() returns the architecture version of the supported MMU > > >> > which on ARM11MPCore is the same as on ARMv7. > > >> > > > >> > Even if it is possible to configure both v6 and v7 in the same kernel, I > > >> > don't think it is currently possible to successfully run such kernel. > > >> > > >> What makes you think that? ?I've been building v6+v7 kernels for Realview > > >> (with a patch to provide the right build options for the ARMv7 arch/arm/mm > > >> files) and ISTR it works fine on my Realview board. > > > > > > I don't remember exactly but it didn't work for me some time ago. I > > > think it failed to build (though I could have worked around this with > > > something like -march=all). > > > > > I think you need the attached patch from Lennert (it was planned to be > > sent later by me) > > Using -Wa,-march= for assembler options is actually a better idea. > I'll update my patch with that (which actually reflects what I did > for Integrator/CP with ARM926 + v6). Ok, here's the combined patch. Ack? arch/arm/mm/Makefile | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile index 827e238..e8d34a8 100644 --- a/arch/arm/mm/Makefile +++ b/arch/arm/mm/Makefile @@ -27,6 +27,9 @@ obj-$(CONFIG_CPU_ABRT_EV5TJ) += abort-ev5tj.o obj-$(CONFIG_CPU_ABRT_EV6) += abort-ev6.o obj-$(CONFIG_CPU_ABRT_EV7) += abort-ev7.o +AFLAGS_abort-ev6.o :=-Wa,-march=armv6k +AFLAGS_abort-ev7.o :=-Wa,-march=armv7-a + obj-$(CONFIG_CPU_PABRT_LEGACY) += pabort-legacy.o obj-$(CONFIG_CPU_PABRT_V6) += pabort-v6.o obj-$(CONFIG_CPU_PABRT_V7) += pabort-v7.o @@ -39,6 +42,9 @@ obj-$(CONFIG_CPU_CACHE_V6) += cache-v6.o obj-$(CONFIG_CPU_CACHE_V7) += cache-v7.o obj-$(CONFIG_CPU_CACHE_FA) += cache-fa.o +AFLAGS_cache-v6.o :=-Wa,-march=armv6 +AFLAGS_cache-v7.o :=-Wa,-march=armv7-a + obj-$(CONFIG_CPU_COPY_V3) += copypage-v3.o obj-$(CONFIG_CPU_COPY_V4WT) += copypage-v4wt.o obj-$(CONFIG_CPU_COPY_V4WB) += copypage-v4wb.o @@ -58,6 +64,9 @@ obj-$(CONFIG_CPU_TLB_V6) += tlb-v6.o obj-$(CONFIG_CPU_TLB_V7) += tlb-v7.o obj-$(CONFIG_CPU_TLB_FA) += tlb-fa.o +AFLAGS_tlb-v6.o :=-Wa,-march=armv6 +AFLAGS_tlb-v7.o :=-Wa,-march=armv7-a + obj-$(CONFIG_CPU_ARM610) += proc-arm6_7.o obj-$(CONFIG_CPU_ARM710) += proc-arm6_7.o obj-$(CONFIG_CPU_ARM7TDMI) += proc-arm7tdmi.o @@ -84,6 +93,9 @@ obj-$(CONFIG_CPU_FEROCEON) += proc-feroceon.o obj-$(CONFIG_CPU_V6) += proc-v6.o obj-$(CONFIG_CPU_V7) += proc-v7.o +AFLAGS_proc-v6.o :=-Wa,-march=armv6 +AFLAGS_proc-v7.o :=-Wa,-march=armv7-a + obj-$(CONFIG_CACHE_FEROCEON_L2) += cache-feroceon-l2.o obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o obj-$(CONFIG_CACHE_XSC3L2) += cache-xsc3l2.o ^ permalink raw reply related [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 17:24 ` Russell King - ARM Linux @ 2010-01-12 18:01 ` Catalin Marinas 2010-01-12 19:55 ` Nicolas Pitre 1 sibling, 0 replies; 14+ messages in thread From: Catalin Marinas @ 2010-01-12 18:01 UTC (permalink / raw) To: linux-arm-kernel On Tue, 2010-01-12 at 17:24 +0000, Russell King - ARM Linux wrote: > On Tue, Jan 12, 2010 at 05:17:33PM +0000, Russell King - ARM Linux wrote: > > On Tue, Jan 12, 2010 at 07:03:35PM +0200, saeed bishara wrote: > > > On Tue, Jan 12, 2010 at 6:55 PM, Catalin Marinas > > > <catalin.marinas@arm.com> wrote: > > > > On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote: > > > >> On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: > > > >> > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: > > > >> > > The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > > > >> > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > > > >> > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > > > >> > > will identify it as ARMv7, and if the kernel was configured with > > > >> > > CPU_V7 only, then the lookup_processor_type() function also will > > > >> > > identify it as ARMv7. Am I missing something here? > > > >> > > > > >> > cpu_architecture() returns the architecture version of the supported MMU > > > >> > which on ARM11MPCore is the same as on ARMv7. > > > >> > > > > >> > Even if it is possible to configure both v6 and v7 in the same kernel, I > > > >> > don't think it is currently possible to successfully run such kernel. > > > >> > > > >> What makes you think that? I've been building v6+v7 kernels for Realview > > > >> (with a patch to provide the right build options for the ARMv7 arch/arm/mm > > > >> files) and ISTR it works fine on my Realview board. > > > > > > > > I don't remember exactly but it didn't work for me some time ago. I > > > > think it failed to build (though I could have worked around this with > > > > something like -march=all). > > > > > > > I think you need the attached patch from Lennert (it was planned to be > > > sent later by me) > > > > Using -Wa,-march= for assembler options is actually a better idea. > > I'll update my patch with that (which actually reflects what I did > > for Integrator/CP with ARM926 + v6). > > Ok, here's the combined patch. Ack? Looks fine to me. Thanks. -- Catalin ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 17:24 ` Russell King - ARM Linux 2010-01-12 18:01 ` Catalin Marinas @ 2010-01-12 19:55 ` Nicolas Pitre 2010-01-13 11:27 ` saeed bishara 1 sibling, 1 reply; 14+ messages in thread From: Nicolas Pitre @ 2010-01-12 19:55 UTC (permalink / raw) To: linux-arm-kernel On Tue, 12 Jan 2010, Russell King - ARM Linux wrote: > On Tue, Jan 12, 2010 at 05:17:33PM +0000, Russell King - ARM Linux wrote: > > On Tue, Jan 12, 2010 at 07:03:35PM +0200, saeed bishara wrote: > > > On Tue, Jan 12, 2010 at 6:55 PM, Catalin Marinas > > > <catalin.marinas@arm.com> wrote: > > > > On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote: > > > >> On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: > > > >> > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: > > > >> > > ? ? The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > > > >> > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > > > >> > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > > > >> > > will identify it as ARMv7, and if the kernel was configured with > > > >> > > CPU_V7 only, then the lookup_processor_type() function also will > > > >> > > identify it as ARMv7. Am I missing something here? > > > >> > > > > >> > cpu_architecture() returns the architecture version of the supported MMU > > > >> > which on ARM11MPCore is the same as on ARMv7. > > > >> > > > > >> > Even if it is possible to configure both v6 and v7 in the same kernel, I > > > >> > don't think it is currently possible to successfully run such kernel. > > > >> > > > >> What makes you think that? ?I've been building v6+v7 kernels for Realview > > > >> (with a patch to provide the right build options for the ARMv7 arch/arm/mm > > > >> files) and ISTR it works fine on my Realview board. > > > > > > > > I don't remember exactly but it didn't work for me some time ago. I > > > > think it failed to build (though I could have worked around this with > > > > something like -march=all). > > > > > > > I think you need the attached patch from Lennert (it was planned to be > > > sent later by me) > > > > Using -Wa,-march= for assembler options is actually a better idea. > > I'll update my patch with that (which actually reflects what I did > > for Integrator/CP with ARM926 + v6). > > Ok, here's the combined patch. Ack? We need this as well so please consider adding it to your tree. Acked-by: Nicolas Pitre <nico@marvell.com> > > arch/arm/mm/Makefile | 12 ++++++++++++ > 1 files changed, 12 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile > index 827e238..e8d34a8 100644 > --- a/arch/arm/mm/Makefile > +++ b/arch/arm/mm/Makefile > @@ -27,6 +27,9 @@ obj-$(CONFIG_CPU_ABRT_EV5TJ) += abort-ev5tj.o > obj-$(CONFIG_CPU_ABRT_EV6) += abort-ev6.o > obj-$(CONFIG_CPU_ABRT_EV7) += abort-ev7.o > > +AFLAGS_abort-ev6.o :=-Wa,-march=armv6k > +AFLAGS_abort-ev7.o :=-Wa,-march=armv7-a > + > obj-$(CONFIG_CPU_PABRT_LEGACY) += pabort-legacy.o > obj-$(CONFIG_CPU_PABRT_V6) += pabort-v6.o > obj-$(CONFIG_CPU_PABRT_V7) += pabort-v7.o > @@ -39,6 +42,9 @@ obj-$(CONFIG_CPU_CACHE_V6) += cache-v6.o > obj-$(CONFIG_CPU_CACHE_V7) += cache-v7.o > obj-$(CONFIG_CPU_CACHE_FA) += cache-fa.o > > +AFLAGS_cache-v6.o :=-Wa,-march=armv6 > +AFLAGS_cache-v7.o :=-Wa,-march=armv7-a > + > obj-$(CONFIG_CPU_COPY_V3) += copypage-v3.o > obj-$(CONFIG_CPU_COPY_V4WT) += copypage-v4wt.o > obj-$(CONFIG_CPU_COPY_V4WB) += copypage-v4wb.o > @@ -58,6 +64,9 @@ obj-$(CONFIG_CPU_TLB_V6) += tlb-v6.o > obj-$(CONFIG_CPU_TLB_V7) += tlb-v7.o > obj-$(CONFIG_CPU_TLB_FA) += tlb-fa.o > > +AFLAGS_tlb-v6.o :=-Wa,-march=armv6 > +AFLAGS_tlb-v7.o :=-Wa,-march=armv7-a > + > obj-$(CONFIG_CPU_ARM610) += proc-arm6_7.o > obj-$(CONFIG_CPU_ARM710) += proc-arm6_7.o > obj-$(CONFIG_CPU_ARM7TDMI) += proc-arm7tdmi.o > @@ -84,6 +93,9 @@ obj-$(CONFIG_CPU_FEROCEON) += proc-feroceon.o > obj-$(CONFIG_CPU_V6) += proc-v6.o > obj-$(CONFIG_CPU_V7) += proc-v7.o > > +AFLAGS_proc-v6.o :=-Wa,-march=armv6 > +AFLAGS_proc-v7.o :=-Wa,-march=armv7-a > + > obj-$(CONFIG_CACHE_FEROCEON_L2) += cache-feroceon-l2.o > obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o > obj-$(CONFIG_CACHE_XSC3L2) += cache-xsc3l2.o > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 19:55 ` Nicolas Pitre @ 2010-01-13 11:27 ` saeed bishara 2010-01-13 11:36 ` Russell King - ARM Linux 0 siblings, 1 reply; 14+ messages in thread From: saeed bishara @ 2010-01-13 11:27 UTC (permalink / raw) To: linux-arm-kernel looks fine to me too. On Tue, Jan 12, 2010 at 9:55 PM, Nicolas Pitre <nico@fluxnic.net> wrote: > On Tue, 12 Jan 2010, Russell King - ARM Linux wrote: > >> On Tue, Jan 12, 2010 at 05:17:33PM +0000, Russell King - ARM Linux wrote: >> > On Tue, Jan 12, 2010 at 07:03:35PM +0200, saeed bishara wrote: >> > > On Tue, Jan 12, 2010 at 6:55 PM, Catalin Marinas >> > > <catalin.marinas@arm.com> wrote: >> > > > On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote: >> > > >> On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: >> > > >> > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: >> > > >> > > ? ? The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to >> > > >> > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and >> > > >> > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() >> > > >> > > will identify it as ARMv7, and if the kernel was configured with >> > > >> > > CPU_V7 only, then the lookup_processor_type() function also will >> > > >> > > identify it as ARMv7. Am I missing something here? >> > > >> > >> > > >> > cpu_architecture() returns the architecture version of the supported MMU >> > > >> > which on ARM11MPCore is the same as on ARMv7. >> > > >> > >> > > >> > Even if it is possible to configure both v6 and v7 in the same kernel, I >> > > >> > don't think it is currently possible to successfully run such kernel. >> > > >> >> > > >> What makes you think that? ?I've been building v6+v7 kernels for Realview >> > > >> (with a patch to provide the right build options for the ARMv7 arch/arm/mm >> > > >> files) and ISTR it works fine on my Realview board. >> > > > >> > > > I don't remember exactly but it didn't work for me some time ago. I >> > > > think it failed to build (though I could have worked around this with >> > > > something like -march=all). >> > > > >> > > I think you need the attached patch from Lennert (it was planned to be >> > > sent later by me) >> > >> > Using -Wa,-march= for assembler options is actually a better idea. >> > I'll update my patch with that (which actually reflects what I did >> > for Integrator/CP with ARM926 + v6). >> >> Ok, here's the combined patch. ?Ack? > > We need this as well so please consider adding it to your tree. > > Acked-by: Nicolas Pitre <nico@marvell.com> > > >> >> ?arch/arm/mm/Makefile | ? 12 ++++++++++++ >> ?1 files changed, 12 insertions(+), 0 deletions(-) >> >> diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile >> index 827e238..e8d34a8 100644 >> --- a/arch/arm/mm/Makefile >> +++ b/arch/arm/mm/Makefile >> @@ -27,6 +27,9 @@ obj-$(CONFIG_CPU_ABRT_EV5TJ) ? ? ? ?+= abort-ev5tj.o >> ?obj-$(CONFIG_CPU_ABRT_EV6) ? += abort-ev6.o >> ?obj-$(CONFIG_CPU_ABRT_EV7) ? += abort-ev7.o >> >> +AFLAGS_abort-ev6.o ? :=-Wa,-march=armv6k >> +AFLAGS_abort-ev7.o ? :=-Wa,-march=armv7-a >> + >> ?obj-$(CONFIG_CPU_PABRT_LEGACY) ? ? ? += pabort-legacy.o >> ?obj-$(CONFIG_CPU_PABRT_V6) ? += pabort-v6.o >> ?obj-$(CONFIG_CPU_PABRT_V7) ? += pabort-v7.o >> @@ -39,6 +42,9 @@ obj-$(CONFIG_CPU_CACHE_V6) ?+= cache-v6.o >> ?obj-$(CONFIG_CPU_CACHE_V7) ? += cache-v7.o >> ?obj-$(CONFIG_CPU_CACHE_FA) ? += cache-fa.o >> >> +AFLAGS_cache-v6.o ? ?:=-Wa,-march=armv6 >> +AFLAGS_cache-v7.o ? ?:=-Wa,-march=armv7-a >> + >> ?obj-$(CONFIG_CPU_COPY_V3) ? ?+= copypage-v3.o >> ?obj-$(CONFIG_CPU_COPY_V4WT) ?+= copypage-v4wt.o >> ?obj-$(CONFIG_CPU_COPY_V4WB) ?+= copypage-v4wb.o >> @@ -58,6 +64,9 @@ obj-$(CONFIG_CPU_TLB_V6) ? ?+= tlb-v6.o >> ?obj-$(CONFIG_CPU_TLB_V7) ? ? += tlb-v7.o >> ?obj-$(CONFIG_CPU_TLB_FA) ? ? += tlb-fa.o >> >> +AFLAGS_tlb-v6.o ? ? ? ? ? ? ?:=-Wa,-march=armv6 >> +AFLAGS_tlb-v7.o ? ? ? ? ? ? ?:=-Wa,-march=armv7-a >> + >> ?obj-$(CONFIG_CPU_ARM610) ? ? += proc-arm6_7.o >> ?obj-$(CONFIG_CPU_ARM710) ? ? += proc-arm6_7.o >> ?obj-$(CONFIG_CPU_ARM7TDMI) ? += proc-arm7tdmi.o >> @@ -84,6 +93,9 @@ obj-$(CONFIG_CPU_FEROCEON) ?+= proc-feroceon.o >> ?obj-$(CONFIG_CPU_V6) ? ? ? ? += proc-v6.o >> ?obj-$(CONFIG_CPU_V7) ? ? ? ? += proc-v7.o >> >> +AFLAGS_proc-v6.o ? ? :=-Wa,-march=armv6 >> +AFLAGS_proc-v7.o ? ? :=-Wa,-march=armv7-a >> + >> ?obj-$(CONFIG_CACHE_FEROCEON_L2) ? ? ?+= cache-feroceon-l2.o >> ?obj-$(CONFIG_CACHE_L2X0) ? ? += cache-l2x0.o >> ?obj-$(CONFIG_CACHE_XSC3L2) ? += cache-xsc3l2.o >> >> _______________________________________________ >> linux-arm-kernel mailing list >> linux-arm-kernel at lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >> > ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-13 11:27 ` saeed bishara @ 2010-01-13 11:36 ` Russell King - ARM Linux 0 siblings, 0 replies; 14+ messages in thread From: Russell King - ARM Linux @ 2010-01-13 11:36 UTC (permalink / raw) To: linux-arm-kernel On Wed, Jan 13, 2010 at 01:27:43PM +0200, saeed bishara wrote: > looks fine to me too. > > On Tue, Jan 12, 2010 at 9:55 PM, Nicolas Pitre <nico@fluxnic.net> wrote: You're both a little too late; it's already in Linus' tree. ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 16:55 ` Catalin Marinas 2010-01-12 17:03 ` saeed bishara @ 2010-01-12 17:06 ` Russell King - ARM Linux 1 sibling, 0 replies; 14+ messages in thread From: Russell King - ARM Linux @ 2010-01-12 17:06 UTC (permalink / raw) To: linux-arm-kernel On Tue, Jan 12, 2010 at 04:55:01PM +0000, Catalin Marinas wrote: > On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote: > > On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote: > > > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: > > > > The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > > > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > > > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > > > > will identify it as ARMv7, and if the kernel was configured with > > > > CPU_V7 only, then the lookup_processor_type() function also will > > > > identify it as ARMv7. Am I missing something here? > > > > > > cpu_architecture() returns the architecture version of the supported MMU > > > which on ARM11MPCore is the same as on ARMv7. > > > > > > Even if it is possible to configure both v6 and v7 in the same kernel, I > > > don't think it is currently possible to successfully run such kernel. > > > > What makes you think that? I've been building v6+v7 kernels for Realview > > (with a patch to provide the right build options for the ARMv7 arch/arm/mm > > files) and ISTR it works fine on my Realview board. > > I don't remember exactly but it didn't work for me some time ago. I > think it failed to build (though I could have worked around this with > something like -march=all). > > If you have a clean patch, please push it upstream. This is what I use, as part of my patches for running the kernel on the model. I have a similar patch for ARMv6 as well. diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile index 055cb2a..35b889c 100644 --- a/arch/arm/mm/Makefile +++ b/arch/arm/mm/Makefile @@ -39,6 +39,8 @@ obj-$(CONFIG_CPU_CACHE_V6) += cache-v6.o obj-$(CONFIG_CPU_CACHE_V7) += cache-v7.o obj-$(CONFIG_CPU_CACHE_FA) += cache-fa.o +AFLAGS_cache-v7.o :=-march=armv7-a + obj-$(CONFIG_CPU_COPY_V3) += copypage-v3.o obj-$(CONFIG_CPU_COPY_V4WT) += copypage-v4wt.o obj-$(CONFIG_CPU_COPY_V4WB) += copypage-v4wb.o @@ -58,6 +60,8 @@ obj-$(CONFIG_CPU_TLB_V6) += tlb-v6.o obj-$(CONFIG_CPU_TLB_V7) += tlb-v7.o obj-$(CONFIG_CPU_TLB_FA) += tlb-fa.o +AFLAGS_tlb-v7.o :=-march=armv7-a + obj-$(CONFIG_CPU_ARM610) += proc-arm6_7.o obj-$(CONFIG_CPU_ARM710) += proc-arm6_7.o obj-$(CONFIG_CPU_ARM7TDMI) += proc-arm7tdmi.o @@ -84,6 +88,8 @@ obj-$(CONFIG_CPU_FEROCEON) += proc-feroceon.o obj-$(CONFIG_CPU_V6) += proc-v6.o obj-$(CONFIG_CPU_V7) += proc-v7.o +AFLAGS_proc-v7.o :=-march=armv7-a + obj-$(CONFIG_CACHE_FEROCEON_L2) += cache-feroceon-l2.o obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o obj-$(CONFIG_CACHE_XSC3L2) += cache-xsc3l2.o ^ permalink raw reply related [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 16:26 ` Catalin Marinas 2010-01-12 16:42 ` Russell King - ARM Linux @ 2010-01-12 16:50 ` saeed bishara 1 sibling, 0 replies; 14+ messages in thread From: saeed bishara @ 2010-01-12 16:50 UTC (permalink / raw) To: linux-arm-kernel On Tue, Jan 12, 2010 at 6:26 PM, Catalin Marinas <catalin.marinas@arm.com> wrote: > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote: >> ? ? The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to >> the http://infocenter.arm.com, its Main ID register is 0x410FB024, and >> the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() >> will identify it as ARMv7, and if the kernel was configured with >> CPU_V7 only, then the lookup_processor_type() function also will >> identify it as ARMv7. Am I missing something here? > > cpu_architecture() returns the architecture version of the supported MMU > which on ARM11MPCore is the same as on ARMv7. but this function used by do_alignment and doesn't seem to be related to MMU type! > > Even if it is possible to configure both v6 and v7 in the same kernel, I > don't think it is currently possible to successfully run such kernel. > > -- > Catalin > > ^ permalink raw reply [flat|nested] 14+ messages in thread
* question about ARM11MP cpu architecture identification 2010-01-12 16:21 question about ARM11MP cpu architecture identification saeed bishara 2010-01-12 16:26 ` Catalin Marinas @ 2010-01-12 16:34 ` Russell King - ARM Linux 1 sibling, 0 replies; 14+ messages in thread From: Russell King - ARM Linux @ 2010-01-12 16:34 UTC (permalink / raw) To: linux-arm-kernel On Tue, Jan 12, 2010 at 06:21:50PM +0200, saeed bishara wrote: > Hi, > The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture() > will identify it as ARMv7, and if the kernel was configured with > CPU_V7 only, then the lookup_processor_type() function also will > identify it as ARMv7. Am I missing something here? Welcome to the wonderful world of *unprintable*. The age of being able to reliably tell what type of CPU you are running on has sadly well and truely passed into history. I'm afraid it's now a hit-and-miss affair. ^ permalink raw reply [flat|nested] 14+ messages in thread
end of thread, other threads:[~2010-01-13 11:36 UTC | newest] Thread overview: 14+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2010-01-12 16:21 question about ARM11MP cpu architecture identification saeed bishara 2010-01-12 16:26 ` Catalin Marinas 2010-01-12 16:42 ` Russell King - ARM Linux 2010-01-12 16:55 ` Catalin Marinas 2010-01-12 17:03 ` saeed bishara 2010-01-12 17:17 ` Russell King - ARM Linux 2010-01-12 17:24 ` Russell King - ARM Linux 2010-01-12 18:01 ` Catalin Marinas 2010-01-12 19:55 ` Nicolas Pitre 2010-01-13 11:27 ` saeed bishara 2010-01-13 11:36 ` Russell King - ARM Linux 2010-01-12 17:06 ` Russell King - ARM Linux 2010-01-12 16:50 ` saeed bishara 2010-01-12 16:34 ` Russell King - ARM Linux
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).