linaro-kernel April 2011

linaro-kernel@lists.linaro.org

37 participants
56 discussions

Fw: Cortex ARMv7 Programmer's Guide / Memory Management / Kernel patch coordination

by Paul E. McKenney

FYI -- new ARM reference manual! This may be downloaded from: https://wiki.linaro.org/Internal/OfficeofCTO Please pass any feedback to David Rusling. Thanx, Paul ----- Forwarded message from David Rusling <david.rusling(a)linaro.org> ----- Date: Tue, 5 Apr 2011 14:02:39 +0100 From: David Rusling <david.rusling(a)linaro.org> To: octo(a)linaro.org, Linaro Tech Leads <techleads(a)linaro.org>, "Paul E. McKenney" <paulmck(a)linux.vnet.ibm.com>, Arnd Bergmann <arnd(a)arndb.de>, Nicolas Pitre <nicolas.pitre(a)linaro.org> Subject: Cortex ARMv7 Programmer's Guide / Memory Management / Kernel patch coordination X-Mailer: Apple Mail (2.1084) All, several topics in one, please see https://wiki.linaro.org/Internal/OfficeofCTO: [1] Programmer's guide - available to everyone in Linaro, not to be redistributed outside. This is a beta and will be released once comments have been collected. Please pass it on to your team members. [2] Memory management - I've outlined the problem and the solution, please give feedback. Jesse owns the execution. [3] Kernel patch coordination - I've outlined the problem and the solution, please give feedback. Based on comments, discussions etc. Please feed any comments to Paul McAteer <Paul.McAteer(a)arm.com> [2] and [3] are not completely disconnected Dave David Rusling, CTO http://www.linaro.org Linaro Lockton House Clarendon Rd Cambridge CB2 8FH ----- End forwarded message -----

13 years

[ACTIVITY] (Dave Martin) week 14 2011 (2011-04-04 - 2011-04-08)

by Dave Martin

== Dave Martin <dmart> == === Activity === ==== hardware-n-kernel-standard-architecture ==== * VFP coredumps patch moving forwards after some fixes. gdb/bfd support now implemented by Ulrich Weigand and confirmed to work. * Spent a bit of time investigating Thumb-2 for imx51 kernels, resulting in some upstream patch discussions. ==== miscellaneous ==== * Minor ongiong activity helping support linaro validation farm activities (network, u8500 bringup) === Plans === * Ping upstream re outstanding patches. * Assess ftrace status. * Write up the output from the Freescale i.MX BSP review discussion, and post for comment. === Absences === * Apr 21 2011 - May 2 2011 (unconfirmed)

13 years

[git pull] device tree changes for linaro-2.6.38

by Grant Likely

Nicolas, here are a couple more changes needed for the 11.05 release. The most important one is Shawn's patch to add a 'dtbs' rule for building all the configured dtb files which is needed for packaging. The second adds device tree support for the IGEP which has been build tested, but that's it since I don't have hardware and I've not cornered anyone to test it yet. I've got it at the top of tree so you can just commit HEAD~1 if you're not comfortable merging that one yet. Can I get a volunteer with an IGEP to test this tree and make sure it boots with the devicetree? Thanks, g. The following changes since commit 7c4bc9c2662c6d9840afed0e29eb01314af9bb78: ARM: Only allow PM_SLEEP with CPUs which support suspend (2011-04-04 00:25:21 -0400) are available in the git repository at: git://git.secretlab.ca/git/linux-2.6 devicetree/arm-linaro-2.6.38 Grant Likely (1): arm/dt: Add basic devicetree support to IGEPv2 and v3 Shawn Guo (1): arm/dt: Add a make rule to build dtb for enabled boards arch/arm/Makefile | 2 +- arch/arm/boot/Makefile | 2 ++ arch/arm/boot/dts/isee-igep-v2.dts | 7 +++++++ arch/arm/boot/dts/isee-igep-v3.dts | 7 +++++++ arch/arm/mach-exynos4/Makefile.boot | 2 ++ arch/arm/mach-mx5/Makefile.boot | 5 +++++ arch/arm/mach-omap2/Makefile.boot | 6 ++++++ arch/arm/mach-omap2/board-igep0020.c | 6 ++++++ arch/arm/mach-omap2/board-igep0030.c | 6 ++++++ arch/arm/mach-tegra/Makefile.boot | 2 ++ arch/arm/mach-versatile/Makefile.boot | 2 ++ 11 files changed, 46 insertions(+), 1 deletions(-) create mode 100644 arch/arm/boot/dts/isee-igep-v2.dts create mode 100644 arch/arm/boot/dts/isee-igep-v3.dts -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd.

13 years

[PATCH v2] arm/dt: Add a make rule to build dtb for enabled boards

by Shawn Guo

With 'make ARCH=arm dtb', it builds Device Tree Blobs for those boards enabled by build CONFIG. Signed-off-by: Shawn Guo <shawn.guo(a)linaro.org> --- It's based on commit fe8e6d0b0e601ca0a63fe768d4b812d5a45a9da7 "arm/dt: Add dtb make rule" from Rob Herring. And it works against Linaro kernel tree. But it needs to go through mainline review before it gets applied. Changes since v1: * Take suggestion from Rob Herring to move .dts dection into machine sepcific Makefile.boot, so that arch/arm/boot/Makefile can be as clean as it is. arch/arm/Makefile | 3 +++ arch/arm/boot/Makefile | 2 ++ arch/arm/mach-exynos4/Makefile.boot | 2 ++ arch/arm/mach-mx5/Makefile.boot | 5 +++++ arch/arm/mach-omap2/Makefile.boot | 4 ++++ arch/arm/mach-tegra/Makefile.boot | 2 ++ arch/arm/mach-versatile/Makefile.boot | 2 ++ 7 files changed, 20 insertions(+), 0 deletions(-) diff --git a/arch/arm/Makefile b/arch/arm/Makefile index d51ab6c..7fd2af9 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -292,6 +292,9 @@ zinstall uinstall install: vmlinux %.dtb: $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ +dtb: + $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ + # We use MRPROPER_FILES and CLEAN_FILES now archclean: $(Q)$(MAKE) $(clean)=$(boot) diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile index 08fc37f..ce39850 100644 --- a/arch/arm/boot/Makefile +++ b/arch/arm/boot/Makefile @@ -63,6 +63,8 @@ endif $(obj)/%.dtb: $(src)/dts/%.dts $(call cmd,dtc) +$(obj)/dtb: $(addprefix $(obj)/, $(dtb-y)) + quiet_cmd_uimage = UIMAGE $@ cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A arm -O linux -T kernel \ -C none -a $(LOADADDR) -e $(STARTADDR) \ diff --git a/arch/arm/mach-exynos4/Makefile.boot b/arch/arm/mach-exynos4/Makefile.boot index d65956f..fcee6b5 100644 --- a/arch/arm/mach-exynos4/Makefile.boot +++ b/arch/arm/mach-exynos4/Makefile.boot @@ -1,2 +1,4 @@ zreladdr-y := 0x40008000 params_phys-y := 0x40000100 + +dtb-$(CONFIG_MACH_SMDKV310) += exynos4-smdkv310.dtb diff --git a/arch/arm/mach-mx5/Makefile.boot b/arch/arm/mach-mx5/Makefile.boot index e928be1..4111462 100644 --- a/arch/arm/mach-mx5/Makefile.boot +++ b/arch/arm/mach-mx5/Makefile.boot @@ -7,3 +7,8 @@ initrd_phys-$(CONFIG_ARCH_MX51) := 0x90800000 zreladdr-$(CONFIG_ARCH_MX53) := 0x70008000 params_phys-$(CONFIG_ARCH_MX53) := 0x70000100 initrd_phys-$(CONFIG_ARCH_MX53) := 0x70800000 + +dtb-$(CONFIG_MACH_MX51_BABBAGE) += mx51-babbage.dtb +dtb-$(CONFIG_MACH_MX51_EFIKAMX) += genesi-efikamx.dtb +dtb-$(CONFIG_MACH_MX51_EFIKASB) += genesi-efikasb.dtb +dtb-$(CONFIG_MACH_MX53_LOCO) += mx53-loco.dtb diff --git a/arch/arm/mach-omap2/Makefile.boot b/arch/arm/mach-omap2/Makefile.boot index 565aff7..0f54901 100644 --- a/arch/arm/mach-omap2/Makefile.boot +++ b/arch/arm/mach-omap2/Makefile.boot @@ -1,3 +1,7 @@ zreladdr-y := 0x80008000 params_phys-y := 0x80000100 initrd_phys-y := 0x80800000 + +dtb-$(CONFIG_MACH_OMAP3_BEAGLE) += omap3-beagle.dtb +dtb-$(CONFIG_MACH_OMAP4_PANDA) += omap4-panda.dtb +dtb-$(CONFIG_MACH_OVERO) += omap3-overo.dtb diff --git a/arch/arm/mach-tegra/Makefile.boot b/arch/arm/mach-tegra/Makefile.boot index db52d61..c98addf 100644 --- a/arch/arm/mach-tegra/Makefile.boot +++ b/arch/arm/mach-tegra/Makefile.boot @@ -1,3 +1,5 @@ zreladdr-$(CONFIG_ARCH_TEGRA_2x_SOC) := 0x00008000 params_phys-$(CONFIG_ARCH_TEGRA_2x_SOC) := 0x00000100 initrd_phys-$(CONFIG_ARCH_TEGRA_2x_SOC) := 0x00800000 + +dtb-$(CONFIG_MACH_HARMONY) += tegra-harmony.dtb diff --git a/arch/arm/mach-versatile/Makefile.boot b/arch/arm/mach-versatile/Makefile.boot index c7e75ac..e2227d3 100644 --- a/arch/arm/mach-versatile/Makefile.boot +++ b/arch/arm/mach-versatile/Makefile.boot @@ -2,3 +2,5 @@ params_phys-y := 0x00000100 initrd_phys-y := 0x00800000 +dtb-$(CONFIG_ARCH_VERSATILE_PB) += versatile-pb.dtb +dtb-$(CONFIG_MACH_VERSATILE_AB) += versatile-ab.dtb -- 1.7.1

13 years

[ACTIVITY] April 1 - April 8

by Jason Hui

== Jason Liu <Jasnliu> == === Highlights === ====DT==== * The basic DT for imx51 babbage, genesi efika mx and imx53 loco board support done, merged into linaro kernel git. ====Kernel kexec ==== * Blueprint: https://blueprints.launchpad.net/linux-linaro/+spec/other-kernel-kexec * [jason] Test kexec-reboot on Freescale platforms: Done * [jason] Test kexec-crashdump on Freescale platforms: Done * I have test the kexec-reboot on Freescale i.mx51 babbage board based on the following git: * kexec:git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/kexec-tools-de… * linux:git://git.linaro.org/kernel/linux-linaro-2.6.38.git * The kexec works fine with my test result: * kexec-reboot, the second kernel can boot up successfully, log is the following: root@freescale ~$ ./kexec -l uImage --type=uImage --append="console=ttymxc0,115200 initcall_debug" root@freescale ~$ ./kexec -e Starting new kernel Bye! Uncompressing Linux... done, booting the kernel. Linux version 2.6.38.2+ (r64343@r64343-desktop) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203) ) #2 Wed Apr 6 15:59:06 CST 2011 * kexec-crashdump, /proc/vmcore is created after boot up capture kernel, log is the following: root@freescale ~$ kexec -p /zImage -t zImage --append="console=ttymxc0,115200 root=/dev/nfs ip=dhcp nfsroot=10.192.242.36:/rootfs_home/mx5_rootfs rw" root@freescale ~$ echo "c" > /proc/sysrq-trigger SysRq : Trigger a crash Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = dfab8000 [00000000] *pgd=af97b831, *pte=00000000, *ppte=00000000 Internal error: Oops: 817 [#1] last sysfs file: /sys/devices/system/cpu/cpu0/crash_notes Modules linked in: [...] Code: e3a03001 e5823000 f57ff04f e3a02000 (e5c23000) Loading crashdump kernel... Bye! Uncompressing Linux... done, booting the kernel. Linux version 2.6.38.2+ (r64343@r64343-desktop) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203) ) #6 Thu Apr 7 17:12:06 CST 2011 CPU: ARMv7 Processor [412fc085] revision 5 (ARMv7), cr=10c53c7f CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache Machine: Freescale MX51 Babbage Board Memory policy: ECC disabled, Data cache writeback Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32258 Kernel command line: console=ttymxc0,115200 root=/dev/nfs ip=dhcp nfsroot=10.192.242.36:/rootfs_home/mx5_rootfs rw elfcorehdr=0x9ef00000 mem=130048K PID hash table entries: 512 (order: -1, 2048 bytes) Dentry cache hash table entries: 16384 (order: 4, 65536 bytes) Inode-cache hash table entries: 8192 (order: 3, 32768 bytes) Memory: 127MB = 127MB total [...] root@freescale ~$ ls -l /proc/vmcore -r-------- 1 root root 402653500 Jan 1 00:00 /proc/vmcore ====Misc==== * Enable L2 cache support in i.mx51/53 uboot. === Plans === * ===Issues=== *

13 years

[ACTIVITY] (Per Forlin) 2011-04-04 - 2011-04-08

by Per Forlin

== Per Forlin <perfor> == === Highlights === * mmc none blocking "PATCH v2" sent out. All tests pass, * Made a really basic draft for storage work 1111. https://wiki.linaro.org/WorkingGroups/Kernel/Specs/StoragePerf_1111_tmp * mmc none blocking gets same performance independent of governor. https://wiki.linaro.org/WorkingGroups/Kernel/Specs/StoragePerfMMC-async-req… === Absence === Wednesday and Friday due child sickness === Plans === * Compare EMMC performace DDR vs no DDR. * Write mmc_test for TRIM

13 years

[PATCH] LINARO: Build .dtb files for packaging

by Shawn Guo

From: Shawn Guo <shawn.guo(a)linaro.org> Signed-off-by: Shawn Guo <shawn.guo(a)linaro.org> --- Hi John, After pulling the latest bits from Nico's tree, you should be able apply this patch on linux-linaro-natty and get .dtb files built in linux-image-*.deb. Regards, Shawn debian/rules.d/2-binary-arch.mk | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk index 93114b2..815d134 100644 --- a/debian/rules.d/2-binary-arch.mk +++ b/debian/rules.d/2-binary-arch.mk @@ -36,6 +36,7 @@ $(stampdir)/stamp-build-%: prepare-% @echo "Building $*..." $(build_cd) $(kmake) $(build_O) $(conc_level) $(build_image) $(build_cd) $(kmake) $(build_O) $(conc_level) modules + $(build_cd) $(kmake) $(build_O) $(conc_level) dtbs @touch $@ # Install the finished build @@ -71,6 +72,11 @@ endif $(pkgdir)/boot/abi-$(abi_release)-$* install -m600 $(builddir)/build-$*/System.map \ $(pkgdir)/boot/System.map-$(abi_release)-$* + + mkdir -p $(pkgdir)/boot/dt-$(abi_release)-$*/ + install -m600 -D $(builddir)/build-$*/arch/$(build_arch)/boot/*.dtb \ + $(pkgdir)/boot/dt-$(abi_release)-$*/ + ifeq ($(no_dumpfile),) makedumpfile -g $(pkgdir)/boot/vmcoreinfo-$(abi_release)-$* \ -x $(builddir)/build-$*/vmlinux -- 1.7.1

13 years

My list of topics/tasks for Linaro 11.11 cycle

by Grant Likely

Hey Paul, As promised, here is my list of topics, tasks and priorities for the 11.11 cycle. It's a bit of a rough list, but I'll refine it as we get closer to UDS Boot Architecture - Refine UEFI position paper (draft of position paper will be prepared before UDS) - Refine boot architecture technical recommendations paper (draft will be prepared before UDS) - must include reference implementation (based on existing u-boot; not talking about writing something new here) - Upgrade procedure for OS - Upgrade procedure for Firmware - Security concerns? - Must guarantee reliability (no bricked boards). - Discuss kexec bootloader, possibly implement for 11.11 cycle - Implement appending of device tree and initrd to zImage - To support minimal bootloader and kexec bootloaders. - Simplify the process of installing a boot image. - Implement device tree bindings to describing boot method - So that Linux knows how to upgrade the kernel and possibly the bootloader. - SDcard? NAND? NOR? Which partition? etc. I've got a lot of topics on boot architecture. Most of the needed technology is in place, but I think it is needed to document best practices and methods that should be used when designing a system. What technologies, why, how to put them together, and how to maintain/support them. It's important to get the guidelines out onto paper instead of as 'tribal knowledge' Device Tree - device tree board description and implementations for: - The omap3 boards are the priority since there are numerous expansion boards that can be described (Zippy, trainer, etc) which is an excellent use-case. - mx51 & mx53 eval and efika boards - samsung eval boards - OMAP3 BeagleBoard, Overo and IGEP boards. - device tree SoC descriptions for SoCs - A lot of work has already been done for Samsung and Freescale SoCs. It would be very interesting to converting an entire SoC over to use device tree with dtb linked into the kernel for bootloaders that cannot pass a dtb blob. That would eliminate the problem of duplicate setup paths - Would also need task to support linking multiple .dtbs into the kernel - Complete clock bindings - mostly depends on common clock framework - Complete virq implementation - **critical task** Linux ARM Maintainership/Vision - Full multiplatform - Support multiple SoC families with a single kernel - to avoid either/or decisions when adding new features to the kernel - have guidelines for how new interfaces should be defined. Example: right now struct clk has a different implementation for every SoC, and only one can be compiled in at a time. New interfaces should be runtime pluggable wherever possible - to increase code coverage for allyesconfig/allmodconfig. - Document best practices for Linux driver model - Where does data come from (probed, device tree, platform_data) - How to generalize as much device registration as possible - How to get away from big lists of devices in board-*.c files. - How to reduce code duplication. Basically, I'd like to encourage embedded Linux engineers to think about the wider scope for the code that they write. To ask themselves if the work they are doing could be useful to the wider ARM Linux infrastructure. I'm not sure how to translate the above items into blueprints, but I think the tasks resolve to writing a lot of documentation and articles, and probably reviewing a lot of code. You can probably take the first level bullet points in each category as names for blueprints. My priorities are to make sure at least one platform has a 100% complete device tree implementation by the 11.11 release, and that there is a good set of documentation to go with it covering both boot architecture and device tree. I'd actually like to see 2 or 3 platforms with a complete implementation, but I'd rather see 1 platform will a full solution than 3 half baked ones. Close second is the boot architecture documentation and any associated sample implementation. Loïc, David, I'm sure I've missed some of the topics we've talked about. Is there anything else you can think of that should be added to this list? g. -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd.

13 years

[ACTIVITY] (Paul E. McKenney) 2011-03-28 - 2011-04-01

by Paul E. McKenney

== Paul E. McKenney <paulmck> == === Highlights == * Working RCU priority boosting bug: reproduced slowdown (not hang) * Coded and tested diagnostics to track down this bug * Found and fixed one bug, more bugs remain * Worked more stuck TSC license requests == Miscellaneous == * Pulled in kfree_rcu() patches from Lai Jiangshan: Nice API addition and code-size reduction *

13 years

[ACTIVITY] (Per Forlin) 2011-03-28 - 2011-04-01

by Per Forlin

== Per Forlin <perfor> == === Highlights === * mmc none blocking implementation is more stable, but there are still some issues when running stress tests for many hours. * In contact with developer at Samsung that is interested in testing my code on the Samsung SoC. * Started to think about storage work for next cycle === Plans === * Make all stress tests to pass for mmc code and send out patches on 2.6.39-rc * Assist in writing storage spec * Continue supporting testing of my mmc code on other boards.

13 years

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linaro-kernel April 2011