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- Patch 05/12 "gpio: sifive: Use generic reg read function" has been superseded by commit 2548493ab4.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...