Hi Simon, Jun,
Hi Jun,
On Fri, 22 Mar 2019 at 16:02, Jun Nie jun.nie@linaro.org wrote:
Simon Glass sjg@chromium.org 于2019年3月22日周五 下午3:56写道：
Hi Jun,
On Fri, 22 Mar 2019 at 15:20, Jun Nie jun.nie@linaro.org wrote:
add skipping init option to avoid corrupt data in console if serial is already initilized when u-boot start its excution.
Signed-off-by: Jun Nie jun.nie@linaro.org
drivers/serial/Kconfig | 6 ++++++ 1 file changed, 6 insertions(+)
Could we use a device-tree property for this? Some UARTs have a 'skip-init' property.
Regards, Simon
Hi Simon,
It is a good suggestion. But device tree is board specific, while the config is boot flow specific. For ATF -> OPTEE -> U-BOOT case, initialization should be skipped. Without earlier initialization from firmware, U-boot should do it by itself. So I need find a solution that is defconfig specific, instead of device tree specific.
So you want something that is flow-specific, I think. Your thinking is that the defconfig specifies this. Is that because certain boards require ATF/Optee?
Should we consider having a way to tell U-Boot that it is running from Optee?
Could the UART driver detect that the UART is already inited?
Isn't this issue similar to: http://patchwork.ozlabs.org/patch/820824/
and
http://patchwork.ozlabs.org/patch/865963/
Regards, Simon _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
Best regards,
Lukasz Majewski
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de