[PATCH v5] Add support for SoM "VoCore2".

[Mauro Condarelli <mc5686@mclink.it>]

Hi Daniel,
a gentle reminder...

I was unable to comply with a few of Your remarks (see below),
What should I do?
Submit v6 as is or do You have specific instructions?

Thanks a lot
Mauro

On 2/12/20 11:01 PM, Mauro Condarelli wrote:
> Thanks Daniel,
>
> On 2/12/20 5:58 PM, Daniel Schwierzeck wrote:
>> On Wed, Feb 12, 2020 at 4:30 PM Mauro Condarelli <mc5686@mclink.it> wrote:
>>> Small patch series to add support for VoCore/VoCore2 board.
>>>
>>> VoCore is open hardware and runs OpenWrt/LEDE.
>>> It has WIFI, USB, UART, 20+ GPIOs but is only one inch square.
>>> It will help you to make a smart house, study embedded system
>>> or even make the tiniest router in the world.
>>>
>>> ===8<---
>>> diff --git a/board/vocore/vocore2/board.c b/board/vocore/vocore2/board.c
>>> new file mode 100644
>>> index 0000000000..27e42d1414
>>> --- /dev/null
>>> +++ b/board/vocore/vocore2/board.c
>>> @@ -0,0 +1,6 @@
>>> +// SPDX-License-Identifier: GPL-2.0+
>>> +/*
>>> + * Copyright (C) 2019 Mauro Condarelli <mc5686@mclink.it>
>>> + *
>>> + * Nothing actually needed here
>>> + */
>> if that file is empty, don't add it at all
> Ahem...
>
> I tried to remove it, but if I do I also have to remove entry
> in board/vocore/vocore2/Makefile (leaving it empty) and this
> leads (on a clean compile) to error:
> ? mipsel-linux-ld.bfd: cannot find board/vocore/vocore2/built-in.o: No
> such file or directory
> Completely removing both files bombs with:
> ? scripts/Makefile.build:57: board/vocore/vocore2/Makefile: No such file
> or directory
> It seems I should also remove board/vocore/vocore2/Kconfig,
> but I'm unsure this is the right thing to do.
>
> I have no idea about how to solve this, sorry.
> Can You point me in the right direction, please?
>
>
>>> ===8<---
>>> diff --git a/include/configs/vocore2.h b/include/configs/vocore2.h
>>> new file mode 100644
>>> index 0000000000..6b43aa766e
>>> --- /dev/null
>>> +++ b/include/configs/vocore2.h
>>> @@ -0,0 +1,61 @@
>>> +/* SPDX-License-Identifier: GPL-2.0+ */
>>> +/*
>>> + * Copyright (C) 2019 Mauro Condarelli <mc5686@mclink.it>
>>> + */
>>> +
>>> +#ifndef __VOCORE2_CONFIG_H__
>>> +#define __VOCORE2_CONFIG_H__
>>> +
>>> +/* CPU */
>>> +#define CONFIG_SYS_MIPS_TIMER_FREQ     290000000
>> is this still necessary? Weijie implemented a custom CPU clock
>> handling which supports
>> dynamic timer clocks.
> This is referenced in arch/mips/cpu/time.c
> I don't know if it's still relevant, but removing it doesn't seem
> task for this patch.
>
>
>>> +
>>> +/* RAM */
>>> +#define CONFIG_SYS_SDRAM_BASE          0x80000000
>>> +
>>> +#define CONFIG_SYS_LOAD_ADDR   CONFIG_SYS_SDRAM_BASE + 0x100000
>>> +
>>> +#define CONFIG_SYS_INIT_SP_OFFSET      0x400000
>>> +
>>> +/* SPL */
>>> +#if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
>>> +#define CONFIG_SKIP_LOWLEVEL_INIT
>>> +#endif
>> CONFIG_SPL_BUILD is only relevant in Makefiles and shouldn't be used
>> in config header files
> Removed, apparently without adverse consequences.
Appearence was misguiding.
Any change to this guard leads to code unable to boot from SPI NOR.
I'll have to leave it is as-is.
Someone more knowledgeable than me will have to understand why
they are needed and how to remove them, if that's a requirement.
After all the other boards with this SoC use the same code.


>>> +
>>> +#define CONFIG_SYS_UBOOT_START         CONFIG_SYS_TEXT_BASE
>>> +#define CONFIG_SPL_BSS_START_ADDR      0x80010000
>>> +#define CONFIG_SPL_BSS_MAX_SIZE                0x10000
>>> +#define CONFIG_SPL_MAX_SIZE            0x10000
>>> +
>>> +/* Dummy value */
>>> +#define CONFIG_SYS_UBOOT_BASE          0
>> where is that needed?
> This is referenced in common/spl/spl_nor.c
> I don't know if it's still relevant, but removing it doesn't seem
> task for this patch.
>
>>> ==8<---
>>>
> I'll wait for input before submitting another iteration.
>
> Thanks a lot
> Mauro