From mboxrd@z Thu Jan 1 00:00:00 1970 From: thierry.reding@avionic-design.de (Thierry Reding) Date: Thu, 3 Jan 2013 22:29:04 +0100 Subject: [PATCH] ARM: tegra: add kexec support to defconfig In-Reply-To: <50E5F5A3.1060507@wwwdotorg.org> References: <1357161141-26430-1-git-send-email-swarren@wwwdotorg.org> <20130103210541.GB4412@avionic-0098.adnet.avionic-design.de> <50E5F5A3.1060507@wwwdotorg.org> Message-ID: <20130103212903.GA27749@avionic-0098.adnet.avionic-design.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > >> > >> Signed-off-by: Stephen Warren --- > >> 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 836 bytes Desc: not available URL: