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Date: Fri, 07 Aug 2020 18:45:57 +0200
From: Paul Cercueil <paul@...pouillou.net>
To: Zhou Yanjie <zhouyanjie@...yeetech.com>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Paul Burton <paulburton@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>, od@...c.me,
linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
漆鹏振 <aric.pzqi@...enic.com>,
dongsheng.qiu@...enic.com, rick.tyliu@...enic.com,
yanfei.li@...enic.com, xuwanhao@...yeetech.com
Subject: Re: [PATCH 00/13] MIPS: Convert Ingenic to a generic board
Hi Zhou,
Le sam. 8 août 2020 à 0:23, Zhou Yanjie <zhouyanjie@...yeetech.com> a
écrit :
> Hi Paul,
>
> I'm not too sure if remove "cpu-feature-overrides.h" will cause some
> problems for X2000, because according to my current test on X2000, I
> found that it is somewhat different from the SoCs using XBurst1 CPU
> core, with the kernel source code provided by Ingenic, for example,
> we must configure "#define cpu_has_tlbinv 1" in
> "cpu-feature-overrides.h" to make the X2000 work normally, otherwise
> the kernel will get stuck. And X2000's interrupt controller has also
> been redesigned. If these differences make it impossible to share
> code, should we set a subdirectory of "xburst" and "xburst2" in
> "arch/mips/ingenic"? (I am just worried about this situation, so far
> I have not been able to successfully run the mainline kernel on
> X2000).
The <cpu-feature-overrides.h> is kind of a hack, to hardcode settings
in case the CPU is not properly detected. The cpu-probe.c should be
able to auto-detect these settings, including the inverted TLB that the
X2000 has, reading from the CPU config registers ("TLB INV" info should
be in config4). Right now cpu_probe_ingenic() doesn't read config4 (not
present on older SoCs) but that's trivial to add.
As for your other question, I don't see any reason why we wouldn't be
able to support the X2000 aside the others in a generic kernel, so
don't worry :)
Cheers,
-Paul
>
> I have added some related engineers from Ingenic to CC
>
> Thanks and best regards!
>
> 在 2020/8/4 上午1:01, Paul Cercueil 写道:
>> Hi Thomas & list,
>>
>> Here is a set of patches for 5.10 (no rush) to move Ingenic support
>> from
>> arch/mips/jz4740/ to arch/mips/generic/.
>>
>> There are some Kconfig changes that I think should be reviewed in
>> detail
>> to avoid breakages elsewhere. The idea behind these changes is to
>> allow
>> the Ingenic "generic" code to be built in a non-generic kernel, since
>> generic kernels bring lots of dependencies which result in a +7% size
>> increase.
>>
>> Support for booting the generic kernel with a built-in and/or
>> appended
>> devicetree, as well as support for compressed (vmlinuz) kernels, has
>> been added as well.
>>
>> Cheers,
>> -Paul
>>
>> Paul Cercueil (13):
>> MIPS: cpu-probe: Set Ingenic's writecombine to _CACHE_CACHABLE_WA
>> MIPS: cpu-probe: Mark XBurst CPU as having vtagged caches
>> MIPS: cpu-probe: ingenic: Fix broken BUG_ON
>> MIPS: Kconfig: add MIPS_GENERIC_KERNEL symbol
>> MIPS: machine: Add get_system_type callback
>> MIPS: generic: Call the machine's .get_system_type callback if
>> provided
>> MIPS: generic: Support booting with built-in or appended DTB
>> MIPS: generic: Add support for zboot
>> MIPS: generic: Increase NR_IRQS to 256
>> MIPS: generic: Add support for Ingenic SoCs
>> MIPS: jz4740: Drop folder
>> MIPS: configs: Regenerate configs of Ingenic boards
>> MAINTAINERS: Update paths to Ingenic platform code
>>
>> MAINTAINERS | 4 +-
>> arch/mips/Kbuild.platforms | 1 -
>> arch/mips/Kconfig | 43 ++++--
>> arch/mips/configs/ci20_defconfig | 4 +-
>> arch/mips/configs/cu1000-neo_defconfig | 16 +-
>> arch/mips/configs/gcw0_defconfig | 2 +-
>> arch/mips/configs/qi_lb60_defconfig | 5 +-
>> arch/mips/configs/rs90_defconfig | 4 +-
>> arch/mips/generic/Kconfig | 8 +-
>> arch/mips/generic/Makefile | 2 +-
>> arch/mips/generic/Platform | 1 +
>> arch/mips/generic/board-ingenic.c | 108 +++++++++++++
>> arch/mips/generic/init.c | 28 +++-
>> arch/mips/generic/proc.c | 25 ---
>> arch/mips/include/asm/mach-generic/irq.h | 2 +-
>> .../asm/mach-jz4740/cpu-feature-overrides.h | 50 ------
>> arch/mips/include/asm/mach-jz4740/irq.h | 13 --
>> arch/mips/include/asm/machine.h | 1 +
>> arch/mips/include/asm/pgtable-bits.h | 5 -
>> arch/mips/{jz4740 => ingenic}/Kconfig | 16 +-
>> arch/mips/jz4740/Makefile | 9 --
>> arch/mips/jz4740/Platform | 3 -
>> arch/mips/jz4740/setup.c | 145
>> ------------------
>> arch/mips/kernel/cpu-probe.c | 8 +-
>> 24 files changed, 198 insertions(+), 305 deletions(-)
>> create mode 100644 arch/mips/generic/board-ingenic.c
>> delete mode 100644 arch/mips/generic/proc.c
>> delete mode 100644
>> arch/mips/include/asm/mach-jz4740/cpu-feature-overrides.h
>> delete mode 100644 arch/mips/include/asm/mach-jz4740/irq.h
>> rename arch/mips/{jz4740 => ingenic}/Kconfig (91%)
>> delete mode 100644 arch/mips/jz4740/Makefile
>> delete mode 100644 arch/mips/jz4740/Platform
>> delete mode 100644 arch/mips/jz4740/setup.c
>>
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