Thank you for the terrific info and timely advice. I'll proceed as you suggested and report back progress regularly.
Hongfei On Sat, Mar 21, 2015 at 6:21 AM, Gilles Chanteperdrix <[email protected]> wrote: > On Sat, Mar 21, 2015 at 02:11:11PM +0100, Gilles Chanteperdrix wrote: >> On Fri, Mar 20, 2015 at 05:06:36PM -0700, Hongfei Cheng wrote: >> > Gilles - Thank you for sharing the link and updating us with your schedule. >> > >> > I just started to port the I-pipe and Xenomai-3 code for supporting >> > the ARMv8 architecture. Based on my limited understanding of Xenomai, >> > it appears that the following changes are required in order to get >> > Xenomai-3 running on the ARMv8 SoC we plan to use (Qualcomm msm8994): >> > >> > 1). In vendor kernel tree, add I-pipe support to arm64 generic arch >> > code: arch/arm64/boot, arch/arm64/kernel, etc. >> > 2). In vendor kernel tree, add I-pipe support to arm64 MMU: arch/arm64/mm >> > 3). In vendor kernel tree, add I-pipe support to platform-specific >> > device tree: arm(64)/boot/dts/qcom >> > 4). In vendor kernel tree, add I-pipe support to SoC and platform >> > dependent drivers for arm64: drivers/gpio, drivers/irqchip(?), >> > drivers/clocksource(?) >> > 5). In xenomai-3 tree, support arm64 in Cobalt kernel: >> > kernel/cobalt/arch/arm64 >> > >> > Do you (and anyone else who's working on ARMv8) see any critical >> > modules missing from my list? >> >> No, but the contrary, there is no reason to touch boot, kernel, mm. > > Also, I would do things step by step. First get irq interception > working, then timer interception, at that point I would test with > rtdm kernel tasks only (without CONFIG_SMP). Then add CONFIG_SMP and > get SMP specific stuff working, like IPI interception working, test > with rtdm tasks again, testing on the various cores. Then finally > add fault/syscall interception, and test with default latency test. > > I would use xenomai 3.x for testing, it will avoid quite a few > complicated things (kernel-space tasks without task_struct, hybrid > context switch), and we could leave it at that and decide that > xenomai 2.6 will never support armv8. > > -- > Gilles. _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
