* About LPAE supporting on EXYNOS5440 @ 2013-06-11 8:33 ` Kukjin Kim 0 siblings, 0 replies; 16+ messages in thread From: Kukjin Kim @ 2013-06-11 8:33 UTC (permalink / raw) To: linux-arm-kernel, linux-samsung-soc Cc: 'Arnd Bergmann', 'Olof Johansson' Hi all, The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 have over 8GiB memory. Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 it means supporting LPAE will be selected for other EXYNOS SoCs. I'm wondering if seleting LPAE causes some problem for multiplatform. Can we support LPAE enabled and disabled platform together with single zImage? Thanks, Kukjin ^ permalink raw reply [flat|nested] 16+ messages in thread
* About LPAE supporting on EXYNOS5440 @ 2013-06-11 8:33 ` Kukjin Kim 0 siblings, 0 replies; 16+ messages in thread From: Kukjin Kim @ 2013-06-11 8:33 UTC (permalink / raw) To: linux-arm-kernel Hi all, The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 have over 8GiB memory. Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 it means supporting LPAE will be selected for other EXYNOS SoCs. I'm wondering if seleting LPAE causes some problem for multiplatform. Can we support LPAE enabled and disabled platform together with single zImage? Thanks, Kukjin ^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: About LPAE supporting on EXYNOS5440 2013-06-11 8:33 ` Kukjin Kim @ 2013-06-11 9:53 ` Arnd Bergmann -1 siblings, 0 replies; 16+ messages in thread From: Arnd Bergmann @ 2013-06-11 9:53 UTC (permalink / raw) To: linux-arm-kernel; +Cc: Kukjin Kim, linux-samsung-soc, 'Olof Johansson' On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: > Hi all, > > The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 have > over 8GiB memory. > > Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 it > means supporting LPAE will be selected for other EXYNOS SoCs. > > I'm wondering if seleting LPAE causes some problem for multiplatform. Can we > support LPAE enabled and disabled platform together with single zImage? No, that isn't possible. I think we should enable all exynos support in the regular multi_v7_defconfig and leave LPAE turned off for that, but create another multi_lpae_defconfig that has all LPAE capable machines turned on. This is also what I expect the distros to do. Arnd ^ permalink raw reply [flat|nested] 16+ messages in thread
* About LPAE supporting on EXYNOS5440 @ 2013-06-11 9:53 ` Arnd Bergmann 0 siblings, 0 replies; 16+ messages in thread From: Arnd Bergmann @ 2013-06-11 9:53 UTC (permalink / raw) To: linux-arm-kernel On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: > Hi all, > > The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 have > over 8GiB memory. > > Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 it > means supporting LPAE will be selected for other EXYNOS SoCs. > > I'm wondering if seleting LPAE causes some problem for multiplatform. Can we > support LPAE enabled and disabled platform together with single zImage? No, that isn't possible. I think we should enable all exynos support in the regular multi_v7_defconfig and leave LPAE turned off for that, but create another multi_lpae_defconfig that has all LPAE capable machines turned on. This is also what I expect the distros to do. Arnd ^ permalink raw reply [flat|nested] 16+ messages in thread
* RE: About LPAE supporting on EXYNOS5440 2013-06-11 9:53 ` Arnd Bergmann @ 2013-06-11 10:05 ` Kukjin Kim -1 siblings, 0 replies; 16+ messages in thread From: Kukjin Kim @ 2013-06-11 10:05 UTC (permalink / raw) To: 'Arnd Bergmann', linux-arm-kernel Cc: linux-samsung-soc, 'Olof Johansson' Arnd Bergmann wrote: > > On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: > > Hi all, > > > > The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 > have > > over 8GiB memory. > > > > Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 > it > > means supporting LPAE will be selected for other EXYNOS SoCs. > > > > I'm wondering if seleting LPAE causes some problem for multiplatform. > Can we > > support LPAE enabled and disabled platform together with single zImage? > > No, that isn't possible. Yeah, I know that. > I think we should enable all exynos support in > the > regular multi_v7_defconfig and leave LPAE turned off for that, But if so, problem will happen in the memory parsing without LPAE enabling...so I'm wondering I should deselect exynos5440 in the defconfig for other exynos SoCs... > but create > another multi_lpae_defconfig that has all LPAE capable machines turned on. > This is also what I expect the distros to do. > Yeah, it could be a solution for multiplatform at this moment. And if so, probably I should deselect exynos5440 in the exynos_defconfig and need to add another defconfig for exynos lpae stuff. BTW, do you know what SoCs can support LPAE now? Thanks, Kukjin ^ permalink raw reply [flat|nested] 16+ messages in thread
* About LPAE supporting on EXYNOS5440 @ 2013-06-11 10:05 ` Kukjin Kim 0 siblings, 0 replies; 16+ messages in thread From: Kukjin Kim @ 2013-06-11 10:05 UTC (permalink / raw) To: linux-arm-kernel Arnd Bergmann wrote: > > On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: > > Hi all, > > > > The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 > have > > over 8GiB memory. > > > > Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 > it > > means supporting LPAE will be selected for other EXYNOS SoCs. > > > > I'm wondering if seleting LPAE causes some problem for multiplatform. > Can we > > support LPAE enabled and disabled platform together with single zImage? > > No, that isn't possible. Yeah, I know that. > I think we should enable all exynos support in > the > regular multi_v7_defconfig and leave LPAE turned off for that, But if so, problem will happen in the memory parsing without LPAE enabling...so I'm wondering I should deselect exynos5440 in the defconfig for other exynos SoCs... > but create > another multi_lpae_defconfig that has all LPAE capable machines turned on. > This is also what I expect the distros to do. > Yeah, it could be a solution for multiplatform at this moment. And if so, probably I should deselect exynos5440 in the exynos_defconfig and need to add another defconfig for exynos lpae stuff. BTW, do you know what SoCs can support LPAE now? Thanks, Kukjin ^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: About LPAE supporting on EXYNOS5440 2013-06-11 10:05 ` Kukjin Kim @ 2013-06-11 12:43 ` Arnd Bergmann -1 siblings, 0 replies; 16+ messages in thread From: Arnd Bergmann @ 2013-06-11 12:43 UTC (permalink / raw) To: Kukjin Kim; +Cc: linux-arm-kernel, linux-samsung-soc, 'Olof Johansson' On Tuesday 11 June 2013 19:05:22 Kukjin Kim wrote: > Arnd Bergmann wrote: > > > > On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: > > > Hi all, > > > > > > The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 > > have > > > over 8GiB memory. > > > > > > Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 > > it > > > means supporting LPAE will be selected for other EXYNOS SoCs. > > > > > > I'm wondering if seleting LPAE causes some problem for multiplatform. > > Can we > > > support LPAE enabled and disabled platform together with single zImage? > > > > No, that isn't possible. > > Yeah, I know that. > > > I think we should enable all exynos support in > > the > > regular multi_v7_defconfig and leave LPAE turned off for that, > > But if so, problem will happen in the memory parsing without LPAE > enabling...so I'm wondering I should deselect exynos5440 in the defconfig > for other exynos SoCs... I think there is a bug in the memory parsing code and already two people have submitted independent fixes for that. It really should just work even if you have more memory that ends up getting ignored. > > but create > > another multi_lpae_defconfig that has all LPAE capable machines turned on. > > This is also what I expect the distros to do. > > > Yeah, it could be a solution for multiplatform at this moment. And if so, > probably I should deselect exynos5440 in the exynos_defconfig and need to > add another defconfig for exynos lpae stuff. I would definitely leave on exynos5440 support in defconfig. It's not a lot of extra code, and if you have a system with less than 4GB memory, you really don't want to enable LPAE because of the overhead. > BTW, do you know what SoCs can support LPAE now? Upstream I think we support exynos, vexpress (using A15, A7 and A12 core tiles), omap5 (partially), mvebu (Armada XP), highbank (Midway) and some of the shmobile parts we added in 3.10. In mach-sunxi, there will soon be support for Allwinner-A20 and -A31, which are both Cortex-A7 based. MSM also has support for Cortex-A7 but not upstream. A couple of new platforms are under discussion already that will also have LPAE, mostly server parts. Arnd ^ permalink raw reply [flat|nested] 16+ messages in thread
* About LPAE supporting on EXYNOS5440 @ 2013-06-11 12:43 ` Arnd Bergmann 0 siblings, 0 replies; 16+ messages in thread From: Arnd Bergmann @ 2013-06-11 12:43 UTC (permalink / raw) To: linux-arm-kernel On Tuesday 11 June 2013 19:05:22 Kukjin Kim wrote: > Arnd Bergmann wrote: > > > > On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: > > > Hi all, > > > > > > The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 > > have > > > over 8GiB memory. > > > > > > Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 > > it > > > means supporting LPAE will be selected for other EXYNOS SoCs. > > > > > > I'm wondering if seleting LPAE causes some problem for multiplatform. > > Can we > > > support LPAE enabled and disabled platform together with single zImage? > > > > No, that isn't possible. > > Yeah, I know that. > > > I think we should enable all exynos support in > > the > > regular multi_v7_defconfig and leave LPAE turned off for that, > > But if so, problem will happen in the memory parsing without LPAE > enabling...so I'm wondering I should deselect exynos5440 in the defconfig > for other exynos SoCs... I think there is a bug in the memory parsing code and already two people have submitted independent fixes for that. It really should just work even if you have more memory that ends up getting ignored. > > but create > > another multi_lpae_defconfig that has all LPAE capable machines turned on. > > This is also what I expect the distros to do. > > > Yeah, it could be a solution for multiplatform at this moment. And if so, > probably I should deselect exynos5440 in the exynos_defconfig and need to > add another defconfig for exynos lpae stuff. I would definitely leave on exynos5440 support in defconfig. It's not a lot of extra code, and if you have a system with less than 4GB memory, you really don't want to enable LPAE because of the overhead. > BTW, do you know what SoCs can support LPAE now? Upstream I think we support exynos, vexpress (using A15, A7 and A12 core tiles), omap5 (partially), mvebu (Armada XP), highbank (Midway) and some of the shmobile parts we added in 3.10. In mach-sunxi, there will soon be support for Allwinner-A20 and -A31, which are both Cortex-A7 based. MSM also has support for Cortex-A7 but not upstream. A couple of new platforms are under discussion already that will also have LPAE, mostly server parts. Arnd ^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: About LPAE supporting on EXYNOS5440 2013-06-11 12:43 ` Arnd Bergmann @ 2013-06-12 4:46 ` Subash Patel -1 siblings, 0 replies; 16+ messages in thread From: Subash Patel @ 2013-06-12 4:46 UTC (permalink / raw) To: Arnd Bergmann Cc: Kukjin Kim, 'Olof Johansson', linux-samsung-soc, linux-arm-kernel On 06/11/2013 06:13 PM, Arnd Bergmann wrote: > On Tuesday 11 June 2013 19:05:22 Kukjin Kim wrote: >> Arnd Bergmann wrote: >>> >>> On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: >>>> Hi all, >>>> >>>> The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 >>> have >>>> over 8GiB memory. >>>> >>>> Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 >>> it >>>> means supporting LPAE will be selected for other EXYNOS SoCs. >>>> >>>> I'm wondering if seleting LPAE causes some problem for multiplatform. >>> Can we >>>> support LPAE enabled and disabled platform together with single zImage? >>> >>> No, that isn't possible. >> >> Yeah, I know that. >> >>> I think we should enable all exynos support in >>> the >>> regular multi_v7_defconfig and leave LPAE turned off for that, >> >> But if so, problem will happen in the memory parsing without LPAE >> enabling...so I'm wondering I should deselect exynos5440 in the defconfig >> for other exynos SoCs... > > I think there is a bug in the memory parsing code and already two people > have submitted independent fixes for that. It really should just work > even if you have more memory that ends up getting ignored. > >>> but create >>> another multi_lpae_defconfig that has all LPAE capable machines turned on. >>> This is also what I expect the distros to do. >>> >> Yeah, it could be a solution for multiplatform at this moment. And if so, >> probably I should deselect exynos5440 in the exynos_defconfig and need to >> add another defconfig for exynos lpae stuff. > > I would definitely leave on exynos5440 support in defconfig. It's not a > lot of extra code, and if you have a system with less than 4GB memory, > you really don't want to enable LPAE because of the overhead. Even if we have <= 4GB memory, and the system designers have placed the memory banks in addresses > 2^32 bytes, then we need LPAE support. I think we may have such systems in future. So memory capacity is not the only parameter to judge if we need to enable LPAE or not. Regards, Subash > >> BTW, do you know what SoCs can support LPAE now? > > Upstream I think we support exynos, vexpress (using A15, A7 and A12 > core tiles), omap5 (partially), mvebu (Armada XP), highbank (Midway) > and some of the shmobile parts we added in 3.10. > > In mach-sunxi, there will soon be support for Allwinner-A20 and -A31, > which are both Cortex-A7 based. MSM also has support for Cortex-A7 > but not upstream. A couple of new platforms are under discussion > already that will also have LPAE, mostly server parts. > > Arnd > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > ^ permalink raw reply [flat|nested] 16+ messages in thread
* About LPAE supporting on EXYNOS5440 @ 2013-06-12 4:46 ` Subash Patel 0 siblings, 0 replies; 16+ messages in thread From: Subash Patel @ 2013-06-12 4:46 UTC (permalink / raw) To: linux-arm-kernel On 06/11/2013 06:13 PM, Arnd Bergmann wrote: > On Tuesday 11 June 2013 19:05:22 Kukjin Kim wrote: >> Arnd Bergmann wrote: >>> >>> On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: >>>> Hi all, >>>> >>>> The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 >>> have >>>> over 8GiB memory. >>>> >>>> Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 >>> it >>>> means supporting LPAE will be selected for other EXYNOS SoCs. >>>> >>>> I'm wondering if seleting LPAE causes some problem for multiplatform. >>> Can we >>>> support LPAE enabled and disabled platform together with single zImage? >>> >>> No, that isn't possible. >> >> Yeah, I know that. >> >>> I think we should enable all exynos support in >>> the >>> regular multi_v7_defconfig and leave LPAE turned off for that, >> >> But if so, problem will happen in the memory parsing without LPAE >> enabling...so I'm wondering I should deselect exynos5440 in the defconfig >> for other exynos SoCs... > > I think there is a bug in the memory parsing code and already two people > have submitted independent fixes for that. It really should just work > even if you have more memory that ends up getting ignored. > >>> but create >>> another multi_lpae_defconfig that has all LPAE capable machines turned on. >>> This is also what I expect the distros to do. >>> >> Yeah, it could be a solution for multiplatform at this moment. And if so, >> probably I should deselect exynos5440 in the exynos_defconfig and need to >> add another defconfig for exynos lpae stuff. > > I would definitely leave on exynos5440 support in defconfig. It's not a > lot of extra code, and if you have a system with less than 4GB memory, > you really don't want to enable LPAE because of the overhead. Even if we have <= 4GB memory, and the system designers have placed the memory banks in addresses > 2^32 bytes, then we need LPAE support. I think we may have such systems in future. So memory capacity is not the only parameter to judge if we need to enable LPAE or not. Regards, Subash > >> BTW, do you know what SoCs can support LPAE now? > > Upstream I think we support exynos, vexpress (using A15, A7 and A12 > core tiles), omap5 (partially), mvebu (Armada XP), highbank (Midway) > and some of the shmobile parts we added in 3.10. > > In mach-sunxi, there will soon be support for Allwinner-A20 and -A31, > which are both Cortex-A7 based. MSM also has support for Cortex-A7 > but not upstream. A couple of new platforms are under discussion > already that will also have LPAE, mostly server parts. > > Arnd > > _______________________________________________ > 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] 16+ messages in thread
* Re: About LPAE supporting on EXYNOS5440 2013-06-12 4:46 ` Subash Patel @ 2013-06-12 9:58 ` Arnd Bergmann -1 siblings, 0 replies; 16+ messages in thread From: Arnd Bergmann @ 2013-06-12 9:58 UTC (permalink / raw) To: Subash Patel Cc: Kukjin Kim, 'Olof Johansson', linux-samsung-soc, linux-arm-kernel On Wednesday 12 June 2013, Subash Patel wrote: > > I would definitely leave on exynos5440 support in defconfig. It's not a > > lot of extra code, and if you have a system with less than 4GB memory, > > you really don't want to enable LPAE because of the overhead. > > Even if we have <= 4GB memory, and the system designers have placed the > memory banks in addresses > 2^32 bytes, then we need LPAE support. I > think we may have such systems in future. So memory capacity is not the > only parameter to judge if we need to enable LPAE or not. Yes, but that wasn't the point. You can always build systems with exynos5440 that don't need LPAE, so we should not assume that it is not a reasonable configuration. I would certainly advise system designers to put all the RAM and I/O into normally addressable locations if possible to avoid the need for LPAE, but of course that isn't always possible. We should probably have someone measure the performance impact of LPAE as well. If it's less than a few percent, we might not care all that much. Arnd ^ permalink raw reply [flat|nested] 16+ messages in thread
* About LPAE supporting on EXYNOS5440 @ 2013-06-12 9:58 ` Arnd Bergmann 0 siblings, 0 replies; 16+ messages in thread From: Arnd Bergmann @ 2013-06-12 9:58 UTC (permalink / raw) To: linux-arm-kernel On Wednesday 12 June 2013, Subash Patel wrote: > > I would definitely leave on exynos5440 support in defconfig. It's not a > > lot of extra code, and if you have a system with less than 4GB memory, > > you really don't want to enable LPAE because of the overhead. > > Even if we have <= 4GB memory, and the system designers have placed the > memory banks in addresses > 2^32 bytes, then we need LPAE support. I > think we may have such systems in future. So memory capacity is not the > only parameter to judge if we need to enable LPAE or not. Yes, but that wasn't the point. You can always build systems with exynos5440 that don't need LPAE, so we should not assume that it is not a reasonable configuration. I would certainly advise system designers to put all the RAM and I/O into normally addressable locations if possible to avoid the need for LPAE, but of course that isn't always possible. We should probably have someone measure the performance impact of LPAE as well. If it's less than a few percent, we might not care all that much. Arnd ^ permalink raw reply [flat|nested] 16+ messages in thread
* RE: About LPAE supporting on EXYNOS5440 2013-06-12 9:58 ` Arnd Bergmann @ 2013-06-13 12:53 ` Kukjin Kim -1 siblings, 0 replies; 16+ messages in thread From: Kukjin Kim @ 2013-06-13 12:53 UTC (permalink / raw) To: 'Arnd Bergmann', 'Subash Patel' Cc: 'Olof Johansson', linux-samsung-soc, linux-arm-kernel Arnd Bergmann wrote: > > On Wednesday 12 June 2013, Subash Patel wrote: > > > I would definitely leave on exynos5440 support in defconfig. It's not > a > > > lot of extra code, and if you have a system with less than 4GB memory, > > > you really don't want to enable LPAE because of the overhead. > > > > Even if we have <= 4GB memory, and the system designers have placed the > > memory banks in addresses > 2^32 bytes, then we need LPAE support. I > > think we may have such systems in future. So memory capacity is not the > > only parameter to judge if we need to enable LPAE or not. > > Yes, but that wasn't the point. You can always build systems with > exynos5440 that don't need LPAE, so we should not assume that it is > not a reasonable configuration. > Agreed. > I would certainly advise system designers to put all the RAM and I/O > into normally addressable locations if possible to avoid the need > for LPAE, but of course that isn't always possible. > Yes, same here. Actually, some IPs sometimes can request to alloc/use something like dma buffer over 32 bit area after LPAE enabling, but will not be happened without LPAE. > We should probably have someone measure the performance impact > of LPAE as well. If it's less than a few percent, we might not > care all that much. > Yes, after testing on exynos5440 board, LPAE doesn't cause any performance degradation with lmbench tool. - Kukjin ^ permalink raw reply [flat|nested] 16+ messages in thread
* About LPAE supporting on EXYNOS5440 @ 2013-06-13 12:53 ` Kukjin Kim 0 siblings, 0 replies; 16+ messages in thread From: Kukjin Kim @ 2013-06-13 12:53 UTC (permalink / raw) To: linux-arm-kernel Arnd Bergmann wrote: > > On Wednesday 12 June 2013, Subash Patel wrote: > > > I would definitely leave on exynos5440 support in defconfig. It's not > a > > > lot of extra code, and if you have a system with less than 4GB memory, > > > you really don't want to enable LPAE because of the overhead. > > > > Even if we have <= 4GB memory, and the system designers have placed the > > memory banks in addresses > 2^32 bytes, then we need LPAE support. I > > think we may have such systems in future. So memory capacity is not the > > only parameter to judge if we need to enable LPAE or not. > > Yes, but that wasn't the point. You can always build systems with > exynos5440 that don't need LPAE, so we should not assume that it is > not a reasonable configuration. > Agreed. > I would certainly advise system designers to put all the RAM and I/O > into normally addressable locations if possible to avoid the need > for LPAE, but of course that isn't always possible. > Yes, same here. Actually, some IPs sometimes can request to alloc/use something like dma buffer over 32 bit area after LPAE enabling, but will not be happened without LPAE. > We should probably have someone measure the performance impact > of LPAE as well. If it's less than a few percent, we might not > care all that much. > Yes, after testing on exynos5440 board, LPAE doesn't cause any performance degradation with lmbench tool. - Kukjin ^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: About LPAE supporting on EXYNOS5440 2013-06-11 9:53 ` Arnd Bergmann @ 2013-06-12 0:11 ` Olof Johansson -1 siblings, 0 replies; 16+ messages in thread From: Olof Johansson @ 2013-06-12 0:11 UTC (permalink / raw) To: Arnd Bergmann; +Cc: linux-arm-kernel, Kukjin Kim, linux-samsung-soc On Tue, Jun 11, 2013 at 11:53:36AM +0200, Arnd Bergmann wrote: > On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: > > Hi all, > > > > The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 have > > over 8GiB memory. > > > > Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 it > > means supporting LPAE will be selected for other EXYNOS SoCs. > > > > I'm wondering if seleting LPAE causes some problem for multiplatform. Can we > > support LPAE enabled and disabled platform together with single zImage? > > No, that isn't possible. I think we should enable all exynos support in the > regular multi_v7_defconfig and leave LPAE turned off for that, but create > another multi_lpae_defconfig that has all LPAE capable machines turned on. > This is also what I expect the distros to do. I think it would be unfortunate to split the defconfig just for LPAE, since all the other parts should be identical (drivers, etc). I wonder if it makes more sense to just include a config fragment to turn on LPAE together with the existing multi_v7_defconfig. -Olof ^ permalink raw reply [flat|nested] 16+ messages in thread
* About LPAE supporting on EXYNOS5440 @ 2013-06-12 0:11 ` Olof Johansson 0 siblings, 0 replies; 16+ messages in thread From: Olof Johansson @ 2013-06-12 0:11 UTC (permalink / raw) To: linux-arm-kernel On Tue, Jun 11, 2013 at 11:53:36AM +0200, Arnd Bergmann wrote: > On Tuesday 11 June 2013 17:33:33 Kukjin Kim wrote: > > Hi all, > > > > The exynos5440 can support LPAE and referece boards, SSDK5440 and SD5v1 have > > over 8GiB memory. > > > > Current exynos_defconfig selects every EXYNOS SoCs including exynos5440 it > > means supporting LPAE will be selected for other EXYNOS SoCs. > > > > I'm wondering if seleting LPAE causes some problem for multiplatform. Can we > > support LPAE enabled and disabled platform together with single zImage? > > No, that isn't possible. I think we should enable all exynos support in the > regular multi_v7_defconfig and leave LPAE turned off for that, but create > another multi_lpae_defconfig that has all LPAE capable machines turned on. > This is also what I expect the distros to do. I think it would be unfortunate to split the defconfig just for LPAE, since all the other parts should be identical (drivers, etc). I wonder if it makes more sense to just include a config fragment to turn on LPAE together with the existing multi_v7_defconfig. -Olof ^ permalink raw reply [flat|nested] 16+ messages in thread
end of thread, other threads:[~2013-06-13 12:53 UTC | newest] Thread overview: 16+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2013-06-11 8:33 About LPAE supporting on EXYNOS5440 Kukjin Kim 2013-06-11 8:33 ` Kukjin Kim 2013-06-11 9:53 ` Arnd Bergmann 2013-06-11 9:53 ` Arnd Bergmann 2013-06-11 10:05 ` Kukjin Kim 2013-06-11 10:05 ` Kukjin Kim 2013-06-11 12:43 ` Arnd Bergmann 2013-06-11 12:43 ` Arnd Bergmann 2013-06-12 4:46 ` Subash Patel 2013-06-12 4:46 ` Subash Patel 2013-06-12 9:58 ` Arnd Bergmann 2013-06-12 9:58 ` Arnd Bergmann 2013-06-13 12:53 ` Kukjin Kim 2013-06-13 12:53 ` Kukjin Kim 2013-06-12 0:11 ` Olof Johansson 2013-06-12 0:11 ` Olof Johansson
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