Message ID | 1357161141-26430-1-git-send-email-swarren@wwwdotorg.org |
---|---|
State | Accepted, archived |
Headers | show |
On 01/02/2013 02:12 PM, Stephen Warren wrote:
>...
Applied to (squashed into) Tegra's for-3.9/defconfig branch.
--
To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Jan 02, 2013 at 02:12:21PM -0700, Stephen Warren wrote: > From: Stephen Warren <swarren@nvidia.com> > > Signed-off-by: Stephen Warren <swarren@nvidia.com> > --- > arch/arm/configs/tegra_defconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm/configs/tegra_defconfig b/arch/arm/configs/tegra_defconfig > index 742dc41..e621603 100644 > --- a/arch/arm/configs/tegra_defconfig > +++ b/arch/arm/configs/tegra_defconfig > @@ -34,6 +34,7 @@ CONFIG_AEABI=y > CONFIG_HIGHMEM=y > CONFIG_ZBOOT_ROM_TEXT=0x0 > CONFIG_ZBOOT_ROM_BSS=0x0 > +CONFIG_KEXEC=y > CONFIG_CPU_FREQ=y > CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y > CONFIG_CPU_IDLE=y Interesting. What do you plan to use this for? kdump? Thierry
On 01/03/2013 02:05 PM, Thierry Reding wrote: > On Wed, Jan 02, 2013 at 02:12:21PM -0700, Stephen Warren wrote: >> From: Stephen Warren <swarren@nvidia.com> >> >> Signed-off-by: Stephen Warren <swarren@nvidia.com> --- >> arch/arm/configs/tegra_defconfig | 1 + 1 file changed, 1 >> insertion(+) >> >> diff --git a/arch/arm/configs/tegra_defconfig >> b/arch/arm/configs/tegra_defconfig index 742dc41..e621603 100644 >> --- a/arch/arm/configs/tegra_defconfig +++ >> b/arch/arm/configs/tegra_defconfig @@ -34,6 +34,7 @@ >> CONFIG_AEABI=y CONFIG_HIGHMEM=y CONFIG_ZBOOT_ROM_TEXT=0x0 >> CONFIG_ZBOOT_ROM_BSS=0x0 +CONFIG_KEXEC=y CONFIG_CPU_FREQ=y >> CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y CONFIG_CPU_IDLE=y > > Interesting. What do you plan to use this for? kdump? I plan to burn a kernel (and a small stub, and a DTB) into flash instead of U-Boot, and hence not have to rely on any bootloader. Even ignoring that, a quick scp of a new kernel to a target followed by a kexec is faster than rebooting all the way through U-Boot's slower Ethernet support to boot a new kernel. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, Jan 03, 2013 at 02:18:27PM -0700, Stephen Warren wrote: > On 01/03/2013 02:05 PM, Thierry Reding wrote: > > On Wed, Jan 02, 2013 at 02:12:21PM -0700, Stephen Warren wrote: > >> From: Stephen Warren <swarren@nvidia.com> > >> > >> Signed-off-by: Stephen Warren <swarren@nvidia.com> --- > >> arch/arm/configs/tegra_defconfig | 1 + 1 file changed, 1 > >> insertion(+) > >> > >> diff --git a/arch/arm/configs/tegra_defconfig > >> b/arch/arm/configs/tegra_defconfig index 742dc41..e621603 100644 > >> --- a/arch/arm/configs/tegra_defconfig +++ > >> b/arch/arm/configs/tegra_defconfig @@ -34,6 +34,7 @@ > >> CONFIG_AEABI=y CONFIG_HIGHMEM=y CONFIG_ZBOOT_ROM_TEXT=0x0 > >> CONFIG_ZBOOT_ROM_BSS=0x0 +CONFIG_KEXEC=y CONFIG_CPU_FREQ=y > >> CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y CONFIG_CPU_IDLE=y > > > > Interesting. What do you plan to use this for? kdump? > > I plan to burn a kernel (and a small stub, and a DTB) into flash > instead of U-Boot, and hence not have to rely on any bootloader. Why does that require kexec support? > Even ignoring that, a quick scp of a new kernel to a target followed > by a kexec is faster than rebooting all the way through U-Boot's > slower Ethernet support to boot a new kernel. That sounds like an interesting approach. I wonder if this actually works with the current state of drivers in mainline. Sounds like this could speed up development quite a bit by avoiding full reboots. Thierry
On 01/03/2013 02:29 PM, Thierry Reding wrote: > On Thu, Jan 03, 2013 at 02:18:27PM -0700, Stephen Warren wrote: >> On 01/03/2013 02:05 PM, Thierry Reding wrote: >>> On Wed, Jan 02, 2013 at 02:12:21PM -0700, Stephen Warren >>> wrote: >>>> From: Stephen Warren <swarren@nvidia.com> >>>> >>>> Signed-off-by: Stephen Warren <swarren@nvidia.com> --- >>>> arch/arm/configs/tegra_defconfig | 1 + 1 file changed, 1 >>>> insertion(+) >>>> >>>> diff --git a/arch/arm/configs/tegra_defconfig >>>> b/arch/arm/configs/tegra_defconfig index 742dc41..e621603 >>>> 100644 --- a/arch/arm/configs/tegra_defconfig +++ >>>> b/arch/arm/configs/tegra_defconfig @@ -34,6 +34,7 @@ >>>> CONFIG_AEABI=y CONFIG_HIGHMEM=y CONFIG_ZBOOT_ROM_TEXT=0x0 >>>> CONFIG_ZBOOT_ROM_BSS=0x0 +CONFIG_KEXEC=y CONFIG_CPU_FREQ=y >>>> CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y CONFIG_CPU_IDLE=y >>> >>> Interesting. What do you plan to use this for? kdump? >> >> I plan to burn a kernel (and a small stub, and a DTB) into flash >> instead of U-Boot, and hence not have to rely on any bootloader. > > Why does that require kexec support? Because I'd be using that kernel plus an initrd to download the "real" kernel over e.g. TFTP and kexec it. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, Jan 03, 2013 at 02:45:02PM -0700, Stephen Warren wrote: > On 01/03/2013 02:29 PM, Thierry Reding wrote: > > On Thu, Jan 03, 2013 at 02:18:27PM -0700, Stephen Warren wrote: > >> On 01/03/2013 02:05 PM, Thierry Reding wrote: > >>> On Wed, Jan 02, 2013 at 02:12:21PM -0700, Stephen Warren > >>> wrote: > >>>> From: Stephen Warren <swarren@nvidia.com> > >>>> > >>>> Signed-off-by: Stephen Warren <swarren@nvidia.com> --- > >>>> arch/arm/configs/tegra_defconfig | 1 + 1 file changed, 1 > >>>> insertion(+) > >>>> > >>>> diff --git a/arch/arm/configs/tegra_defconfig > >>>> b/arch/arm/configs/tegra_defconfig index 742dc41..e621603 > >>>> 100644 --- a/arch/arm/configs/tegra_defconfig +++ > >>>> b/arch/arm/configs/tegra_defconfig @@ -34,6 +34,7 @@ > >>>> CONFIG_AEABI=y CONFIG_HIGHMEM=y CONFIG_ZBOOT_ROM_TEXT=0x0 > >>>> CONFIG_ZBOOT_ROM_BSS=0x0 +CONFIG_KEXEC=y CONFIG_CPU_FREQ=y > >>>> CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y CONFIG_CPU_IDLE=y > >>> > >>> Interesting. What do you plan to use this for? kdump? > >> > >> I plan to burn a kernel (and a small stub, and a DTB) into flash > >> instead of U-Boot, and hence not have to rely on any bootloader. > > > > Why does that require kexec support? > > Because I'd be using that kernel plus an initrd to download the "real" > kernel over e.g. TFTP and kexec it. Right, that makes sense. Thanks for explaining. Thierry
diff --git a/arch/arm/configs/tegra_defconfig b/arch/arm/configs/tegra_defconfig index 742dc41..e621603 100644 --- a/arch/arm/configs/tegra_defconfig +++ b/arch/arm/configs/tegra_defconfig @@ -34,6 +34,7 @@ CONFIG_AEABI=y CONFIG_HIGHMEM=y CONFIG_ZBOOT_ROM_TEXT=0x0 CONFIG_ZBOOT_ROM_BSS=0x0 +CONFIG_KEXEC=y CONFIG_CPU_FREQ=y CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y CONFIG_CPU_IDLE=y