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From: Sean Anderson <seanga2@gmail.com>
To: Carlos Eduardo de Paula <me@carlosedp.com>
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>,
	"Wladimir J. van der Laan" <laanwj@gmail.com>,
	Anup Patel <Anup.Patel@wdc.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	"linux-riscv@lists.infradead.org"
	<linux-riscv@lists.infradead.org>
Subject: Re: [PATCH 08/10] riscv: Add Kendryte K210 device tree
Date: Tue, 18 Feb 2020 12:48:51 -0500
Message-ID: <8108cb8e-a909-24b0-f1c4-24a5bebf4e65@gmail.com> (raw)
In-Reply-To: <CADnnUqfSq5sNXMQLktU0R_XLvYrf00nqMG5UPkTwaeL-Cy1m_A@mail.gmail.com>

On 2/18/20 9:30 AM, Carlos Eduardo de Paula wrote:
> On Tue, Feb 18, 2020 at 11:18 AM Sean Anderson <seanga2@gmail.com> wrote:
>>
>> On 2/18/20 9:12 AM, Carlos Eduardo de Paula wrote:
>>> Maybe it's a known thing but I found an MMU implementation here:
>>> https://gist.github.com/44670/0d8c152df7c5b59d17d469aba4dda0e5
>>
>> Yeah, that's part of the evidence which convinced me to research the vm
>> capabilities of the k210 after I saw Christoph's series was NOMMU.
>>
>>> Comes from as fork of the sdk here https://github.com/44670/libk9
>>> implementing also the LCD and other peripheral support.

So the LCD connector is supposed to be for a ST7789V controller, but
there doesn't appear to be a driver in Linux for it. I don't have an
appropriate LCD screen, so I will not be able to write a driver.

>>>
>>> Might help out adding support to it.
>>
>> Hmm, maybe. I've been wrangling a bit trying to get the SD card slot to
>> work.
>>
>> --Sean
> 
> Yes, I started looking at the SD card but had no clue on what needs to
> be done regarding GPIO - FPIO - SPI pre-reqs for it.

There is no need for GPIOs. The datasheet shows SPI0 as hooked up to the
SD card, but the default pinconf doesn't have it hooked up. In addition,
the dedicated SPI0 data lines are already connected to the LCD. For
these reasons, I decided to hook up SPI1 to the card slot. I have some
preliminary patches to add FPIOA support to u-boot. If you are
interested in my current progress, it is availible from [1]. This is not
a "stable" branch though, and I frequently rebase/force-push to it.

[1] https://github.com/Forty-Bot/u-boot/tree/maix_v6

> Wladimir (don't know his email) started playing with UART1 interface
> to the 8285 module to allow WiFi communication. We thought about
> having a TUN/TAP interface over it to bring the TCP/IP stack up.
> https://twitter.com/orionwl/status/1229442145628585990

Nice. I don't think too many raw register pokes should be needed,
because you are just using a uart to communicate...

--Sean



  reply index

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-12 10:34 [PATCH 00/10] Kendryte k210 SoC boards support Damien Le Moal
2020-02-12 10:34 ` [PATCH 01/10] riscv: Fix gitignore Damien Le Moal
2020-02-20  0:15   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 02/10] riscv: Force flat memory model with no-mmu Damien Le Moal
2020-02-14 20:18   ` Sean Anderson
2020-02-15  2:15     ` Damien Le Moal
2020-02-15  2:26       ` Sean Anderson
2020-02-15  2:40         ` Damien Le Moal
2020-03-02  3:48   ` Anup Patel
2020-03-04 18:38   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 03/10] riscv: Unaligned load/store handling for M_MODE Damien Le Moal
2020-03-02  3:57   ` Anup Patel
2020-03-04 19:28   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 04/10] riscv: Add BUILTIN_DTB support Damien Le Moal
2020-03-02  3:58   ` Anup Patel
2020-03-04 19:28   ` Palmer Dabbelt
2020-03-05  4:58     ` Anup Patel
2020-03-05  5:14       ` Damien Le Moal
2020-03-05  5:37         ` Anup Patel
2020-03-05  6:13           ` Damien Le Moal
2020-03-08  6:10             ` Anup Patel
2020-03-05  8:18         ` Atish Patra
2020-03-07  0:02           ` Sean Anderson
2020-03-07  1:51             ` Atish Patra
2020-03-07  2:08               ` Sean Anderson
2020-03-06 23:56         ` Sean Anderson
2020-02-12 10:34 ` [PATCH 05/10] riscv: Add SOC early init support Damien Le Moal
2020-03-04 19:28   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 06/10] riscv: Add Kendryte K210 SoC support Damien Le Moal
2020-02-14 20:31   ` Sean Anderson
2020-03-04 19:38   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 07/10] riscv: Select required drivers for Kendryte SOC Damien Le Moal
2020-03-02  3:59   ` Anup Patel
2020-03-04 19:44   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 08/10] riscv: Add Kendryte K210 device tree Damien Le Moal
2020-02-14 20:51   ` Sean Anderson
2020-02-15  2:34     ` Damien Le Moal
2020-02-15  2:48       ` Sean Anderson
2020-02-15  3:00         ` Damien Le Moal
2020-02-18 14:12           ` Carlos Eduardo de Paula
2020-02-18 14:18             ` Sean Anderson
2020-02-18 14:30               ` Carlos Eduardo de Paula
2020-02-18 17:48                 ` Sean Anderson [this message]
2020-02-18 19:26                   ` Carlos Eduardo de Paula
2020-02-19  9:06                     ` Wladimir J. van der Laan
2020-02-19 22:28                       ` Sean Anderson
2020-02-20 10:48                         ` Wladimir J. van der Laan
2020-02-22 19:07                       ` Wladimir J. van der Laan
2020-04-01 17:55                         ` Drew Fustini
2020-04-02  2:24                           ` Damien Le Moal
2020-02-19  8:50                   ` Wladimir J. van der Laan
2020-02-27 19:43       ` Sean Anderson
2020-03-02  4:06   ` Anup Patel
2020-03-02  4:15     ` Damien Le Moal
2020-03-02  4:22       ` Anup Patel
2020-03-02  4:51         ` Damien Le Moal
2020-03-02  5:05           ` Anup Patel
2020-03-02  5:08             ` Damien Le Moal
2020-03-07  0:18               ` Sean Anderson
2020-03-07  4:11                 ` Anup Patel
2020-03-04 19:44   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 09/10] riscv: Kendryte K210 default config Damien Le Moal
2020-03-02  4:07   ` Anup Patel
2020-03-04 19:44   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 10/10] riscv: create a loader.bin for the kendryte kflash.py tool Damien Le Moal
2020-03-02  4:08   ` Anup Patel
2020-03-04 19:44   ` Palmer Dabbelt
2020-02-14 15:05 ` [PATCH 00/10] Kendryte k210 SoC boards support Carlos Eduardo de Paula
2020-02-15  2:02   ` Damien Le Moal
2020-02-17 13:28     ` Carlos Eduardo de Paula
2020-02-26 21:31       ` Carlos Eduardo de Paula
2020-02-27  2:18         ` Damien Le Moal
2020-02-28 20:32 ` Sean Anderson
2020-03-02  3:01   ` Damien Le Moal
2020-03-02  3:53     ` Sean Anderson
2020-03-02  4:11       ` Damien Le Moal
2020-03-02  4:18         ` Sean Anderson
2020-03-02  4:54           ` Damien Le Moal
2020-03-02  4:56             ` Sean Anderson
2020-03-02  5:03               ` Damien Le Moal
2020-03-02  4:17       ` Anup Patel
2020-03-02  4:21         ` Sean Anderson
2020-03-02  4:48         ` Damien Le Moal
2020-03-02  4:51           ` Damien Le Moal
2020-03-02  5:02           ` Sean Anderson
2020-03-02  5:11             ` Damien Le Moal
2020-03-02  5:25               ` Sean Anderson
2020-03-02  5:43                 ` Damien Le Moal
2020-03-04 19:44 ` Palmer Dabbelt

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