What does the device actually use for debug port?
The fex file in sunxi-boards says:
This is not used at all by the kernel. The debug port is hardcoded in
the defconfig and set up very early (in early ASM code).
uboot could presumably include the debug uart specification it set up
in the
On Tue, Sep 23, 2014 at 07:06:54PM +0200, Paul Kocialkowski wrote:
Le dimanche 21 septembre 2014 à 19:16 +0200, Luc Verhaegen a écrit :
Crap.
Let me see if i can work some heuristics into this: we assume that
u-boot set up a debug uart correctly, and then use that one.
Would a
tis 2014-09-23 klockan 19:03 +0200 skrev Paul Kocialkowski:
As far as I
know, the U-Boot debug UART output is hardcoded in the config as well
(CONS_INDEX), so it could be handed to the kernel correctly.
The u-boot console UART is only hardcoded in config because we haven't
cared to implement
Specifying the early debug UART
through cmdline is not standard behavior.
Note that this is different from the console kernel cmdline parameter.
This is instead about earlyprintk.
It's possible and well defined to use kernel command line arguments to
specify the earlycon console and
tis 2014-09-23 klockan 21:40 +0200 skrev Paul Kocialkowski:
Alright. It is however not used on our sunxi-3.4 code, nor on the U-Boot
we maintain.
Our sunxi-3.4 kernel do use pinmappings from the FEX file, even for UART
pinmappings. See drivers/tty/serial/8250/8250_sunxi.c for the UART
parts.
Le mardi 23 septembre 2014 à 22:33 +0200, Henrik Nordström a écrit :
tis 2014-09-23 klockan 21:40 +0200 skrev Paul Kocialkowski:
Alright. It is however not used on our sunxi-3.4 code, nor on the U-Boot
we maintain.
Our sunxi-3.4 kernel do use pinmappings from the FEX file, even for UART
On Sun, Sep 21, 2014 at 04:16:21PM +0200, Paul Kocialkowski wrote:
UART0 with the default pinmux can never lead to a working UART on A13,
as these pins are not available on the A13 package. When the A13 based
device has its accessible UART on UART1, then the UART0 setting does not
hurt, it
On 21 September 2014 19:16, Luc Verhaegen l...@skynet.be wrote:
On Sun, Sep 21, 2014 at 04:16:21PM +0200, Paul Kocialkowski wrote:
UART0 with the default pinmux can never lead to a working UART on A13,
as these pins are not available on the A13 package. When the A13 based
device has its
The sun5i defconfig default of CONFIG_SW_DEBUG_UART=1 is wrong
on all devices except for those who use CONS_INDEX=2 in uboot. In
others, both A10s as A13, it leads to a system which hardlocks.
UART0 with the default pinmux can never lead to a working UART on A13,
as these pins are not available
