Date
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Realtime support for 5.10 on RISC-V -- not there
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Chris Paterson
Hello Pavel,
From: Pavel Machek <pavel@...>We're not currently using- rt with our RZ/Five risc-v SoC. However, if CIP started supporting it we would integrate it into our BSP, as we have done with our other (Arm) products based on the CIP kernel. Kind regards, Chris
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Pavel Machek
Hi!
Yes, that can happen. Plus, the patches are surprisingly small, sohttp://lists.infradead.org/pipermail/linux-riscv/2022-August/018823.htmlI do not think we can or want to support realtime on RISC-V at theIn fact, we couldn't realistically commit to such a non-existing feature maybe -stable-rt tree picks them up even if they miss 6.1. OTOH maybe if would be good to have feedback "is someone using -rt on riscv, and if so, on what hardware"? Best regards, Pavel -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany |
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Jan Kiszka
On 02.09.22 16:47, Jan Kiszka wrote:
On 02.09.22 11:57, Pavel Machek wrote:http://lists.infradead.org/pipermail/linux-riscv/2022-August/018823.htmlHi!Thanks for checking! Same situation in 6.0.y-rt, it seems. Maybe there is a chance to have this in 6.1-rt so that 6.1-cip-rt can pick it up. Jan -- Siemens AG, Technology Competence Center Embedded Linux |
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Jan Kiszka
On 02.09.22 11:57, Pavel Machek wrote:
Hi!Thanks for checking! Same situation in 6.0.y-rt, it seems. In fact, we couldn't realistically commit to such a non-existing feature /wrt long-term support. If there is interest in enabling this, we can start a development effort in upstream. But if that could then be backportable only to the next CIP kernel, would even be open. Jan -- Siemens AG, Technology Competence Center Embedded Linux |
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Pavel Machek
Hi!
In rt wiki, RISC-V is not listed as supported. https://rt.wiki.kernel.org/index.php/CONFIG_PREEMPT_RT_Patch#Platforms_Tested_and_in_Use_with_CONFIG_PREEMPT_RT That may be outdated, but it does not have corresponding config option in 5.10. pavel@duo:~/cip/10$ grep -ri ARCH_SUPPORTS_RT arch/ arch/powerpc/Kconfig: select ARCH_SUPPORTS_RT if HAVE_POSIX_CPU_TIMERS_TASK_WORK arch/arm/Kconfig: select ARCH_SUPPORTS_RT if HAVE_POSIX_CPU_TIMERS_TASK_WORK arch/x86/Kconfig: select ARCH_SUPPORTS_RT arch/arm64/Kconfig: select ARCH_SUPPORTS_RT if HAVE_POSIX_CPU_TIMERS_TASK_WORK arch/Kconfig:config ARCH_SUPPORTS_RT pavel@duo:~/cip/10$ I do not think we can or want to support realtime on RISC-V at the moment. Best regards, Pavel -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany |
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