Message-ID: <1d858dbb-ae85-95a0-3e46-b67017733c04@infradead.org>
Date:   Tue, 7 Mar 2023 18:33:03 -0800
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Subject: Re: [PATCH v3 0/3] Add RISC-V 32 NOMMU support
Content-Language: en-US
To:     Jesse Taube <mr.bossman075@gmail.com>,
        Damien Le Moal <damien.lemoal@opensource.wdc.com>,
        linux-riscv@lists.infradead.org
Cc:     linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
        Yimin Gu <ustcymgu@gmail.com>,
        Damien Le Moal <damien.lemoal@wdc.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Waldemar Brodkorb <wbx@openadk.org>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>
References: <20230301002657.352637-1-Mr.Bossman075@gmail.com>
 <42446784-a88b-df09-41e9-5f685b4df6ee@infradead.org>
 <556ce787-80eb-dc48-f8d6-83e415538e36@opensource.wdc.com>
 <f8f291d9-2723-4ab8-3020-49018757d470@gmail.com>
 <62852ee1-3763-3323-c3a8-f1e84f70204a@infradead.org>
 <c7941231-8ebd-dea5-81f8-3180cfc3f286@gmail.com>
From:   Randy Dunlap <rdunlap@infradead.org>
In-Reply-To: <c7941231-8ebd-dea5-81f8-3180cfc3f286@gmail.com>
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On 3/7/23 18:30, Jesse Taube wrote:
> 
> 
> On 3/7/23 21:16, Randy Dunlap wrote:
>> Hi--
>>
>> On 3/7/23 17:26, Jesse Taube wrote:
>>>
>>>
>>> On 2/28/23 23:42, Damien Le Moal wrote:
>>>> On 3/1/23 13:07, Randy Dunlap wrote:
>>>>> Hi--
>>>>>
>>>>> On 2/28/23 16:26, Jesse Taube wrote:
>>>>>> This patch-set aims to add NOMMU support to RV32.
>>>>>> Many people want to build simple emulators or HDL
>>>>>> models of RISC-V this patch makes it possible to
>>>>>> run linux on them.
>>>>>>
>>>>>> Yimin Gu is the original author of this set.
>>>>>> Submitted here:
>>>>>> https://lists.buildroot.org/pipermail/buildroot/2022-November/656134.html
>>>>>>
>>>>>> Though Jesse T rewrote the Dconf.
>>>>>
>>>>> Dconf?
>>>>>
>>>>>>
>>>>>> The new set:
>>>>>> https://lists.buildroot.org/pipermail/buildroot/2022-December/658258.html
>>>>>> ---
>>>>>> V1->V2:
>>>>>>    - Add Conor's clock patch for implicit div64
>>>>>>    - Fix typo in commit title 3/3
>>>>>>    - Fix typo in commit description 2/3
>>>>>> V2->V3
>>>>>>    - Change from defconfig file to a PHONY config
>>>>>> ---
>>>>>
>>>>> Is this 'rv32_nommu_virt_defconfig' target the only build target
>>>>> that is supported?
>>>>>
>>>>> I ask because I applied the 3 patches and did 25 randconfig builds.
>>>>> 5 of them failed the same way:
>>>>>
>>>>> riscv32-linux-ld: drivers/soc/canaan/k210-sysctl.o: in function `k210_soc_early_init':
>>>>> k210-sysctl.c:(.init.text+0x78): undefined reference to `k210_clk_early_init'
>>> I can not recreate this error.
>>> can you send me the .config you used.
>>>
>>> Thanks,
>>> Jesse Taube
>>
>> Sure, it's attached.
> 
> Hmmm, it links fine for me.
> 
> objdump -x vmlinux | grep k210_clk_early_init
> 81e40124 g     F .init.text     00000088 k210_clk_early_init
> 
> gcc version 11.3.0 (Buildroot 2022.11-361-g1be0d438f7)
> GNU assembler version 2.38 (riscv32-buildroot-linux-uclibc)
> GNU ld (GNU Binutils) 2.38
> 
> what gcc version are you using?


gcc (SUSE Linux) 12.2.1 20230124 [revision 193f7e62815b4089dfaed4c2bd34fd4f10209e27]
from opensuse Tumbleweed.

I'll try it on a current tree...

>>
>>>> Arg. Forgot about that. k210 is rv64 only and while the clk driver could still
>>>> compile test with rv32 (or any arch), that driver provides the
>>>> k210_clk_early_init() function which is called very early in the boot process
>>>> from k210_soc_early_init(), which is an SOC_EARLY_INIT_DECLARE() call. The
>>>> problem may be there. Probably should be disabled for rv32 if no SoC need that
>>>> sort of early init call.
>>>>
>>>>>
>>>>> because
>>>>> # CONFIG_COMMON_CLK_K210 is not set
>>>>>
>>>>>
>>>>> Maybe SOC_CANAAN needs some more selects for required code?
>>>>>
>>>>>> Conor Dooley (1):
>>>>>>     clk: k210: remove an implicit 64-bit division
>>>>>>
>>>>>> Jesse Taube (1):
>>>>>>     riscv: configs: Add nommu PHONY defconfig for RV32
>>>>>>
>>>>>> Yimin Gu (1):
>>>>>>     riscv: Kconfig: Allow RV32 to build with no MMU
>>>>>>
>>>>>>    arch/riscv/Kconfig     | 5 ++---
>>>>>>    arch/riscv/Makefile    | 4 ++++
>>>>>>    drivers/clk/clk-k210.c | 2 +-
>>>>>>    3 files changed, 7 insertions(+), 4 deletions(-)
>>>>>>
>>>>>
>>>>
>>

-- 
~Randy