Hi Sean and all,
Sorry for dropping this mail out of the blue.
I'm trying to follow the instrcutions from `doc/board/sipeed/maix.rst` to build and flash u-boot so as to verify Sean's work on `maix_gpio_good` tree.
Yet the console has no output.
Furthermore, I found the documentation on Sipeed board to be a little bit confusing. In your first commit of that document, it's stated that "only the Sipeed MAIX BiT V2.0 (bitm) and Sipeed MAIXDUINO are supported." Yet the later commit (137dc15) added a table which implies that the older version of MAIX BiT is supported. So I'm a bit confused about whether older MAIX BiTs get supported or not ? (I'm testing the builts on the older version.) Does the replacement of CH34x with CH552 may cause the issue I'm encountering ?
By the way, I was trying to use the pre-built toolchain from kendryte's GitHub [1]. Yet the linker (riscv64-unknown-elf-ld.bfd) complains that `-pie` is not supported. Hence I switched to the the binutils v2.34 built from upstream and the u-boot could be built without that hiccup.
Could someone tell me which toolchain is recommended for building the u-boot for boards Kendryte K210 ?
[1] https://github.com/kendryte/kendryte-gnu-toolchainhttps://github.com/kendryt...
Many thanks, Ruinland
On Thu, Aug 20, 2020 at 02:25:36PM +0800, Rick Jian-Zhi Chen(陳建志) wrote:
-----Original Message----- From: Sean Anderson [mailto:seanga2@gmail.com] Sent: Wednesday, August 19, 2020 7:13 PM To: Rick Chen Cc: U-Boot Mailing List; Simon Glass; Tom Rini; Bin Meng; Rick Jian-Zhi Chen(陳建志); Alan Quey-Liang Kao(高魁良) Subject: Re: [PATCH v5 11/11] riscv: Add FPIOA and GPIO support for Kendryte K210
On 8/18/20 11:48 PM, Rick Chen wrote:
Hi Tom
This patch adds the necessary configs and docs for FPIOA and GPIO support on the K210.
The board does not boot unless CONSOLE_LOGLEVEL is set to a non-default value . It also boots when the tree is dirty (and CONSOLE_LOGLEVEL is not changed). It also boots when changes are made to the device tree and then committed. I don't know why this happens. These breakages only occur after bf2fb81ad3.
Signed-off-by: Sean Anderson seanga2@gmail.com
Changes in v5:
- Increase CONSOLE_LOGLEVEL to 5 as a hack to get the board booting again
- Patch 05/12 "gpio: sifive: Use generic reg read function" has been superseded by commit 2548493ab4.
Would you like to pick up this series, [PATCH v5 00/11] riscv: Add FPIOA and GPIO support for Kendryte K210 ? Or maybe it is better to figure out what is wrong here and find the root cause why it need to Increase CONSOLE_LOGLEVEL to 5 as a hack ?
As an additional note, *CONFIG_LOGLEVEL (whoops) can also be decreased for the same effect. In addition, there are several other ways I found to "fix" this bug (as noted in the commit message). If you would like to test this out, I have two trees [1, 2] where this series (actually a slightly earlier version of this series) is applied just before and just after bf2fb81ad3. The original patch is located at [3].
--Sean
[1] https://github.com/Forty-Bot/u-boot/tree/maix_gpio_good [2] https://github.com/Forty-Bot/u-boot/tree/maix_gpio_bad [3] https://patchwork.ozlabs.org/project/uboot/patch/20200724111225.12513-15-ovi...