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Nokia RX-51: Document debugging options and compile command

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Add example command how to compile U-Boot and add new documentation section
describing how to enable early debug UART and verbose log output for N900.

Signed-off-by: Pali Rohár <pali@kernel.org>
This commit is contained in:
Pali Rohár 2022-11-20 17:56:27 +01:00 committed by Tom Rini
parent 04bb5e95be
commit 9c2d4057e1
1 changed files with 32 additions and 0 deletions
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32
doc/board/nokia/rx51.rst
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@ -9,6 +9,10 @@ on a real N900. It does very little hardware configuration because NOLO has
already configured the board. It is only needed to enable the internal eMMC
memory via the twl4030 regulator which is not enabled by NOLO.
.. code-block:: bash
make CROSS_COMPILE=arm-linux-gnueabi- nokia_rx51_defconfig u-boot.bin
NOLO is expecting a kernel image and will treat any image it finds in
OneNAND as such. This u-boot is intended to be flashed to the N900 like
a kernel. In order to transparently boot the original kernel, it will be
@ -160,6 +164,34 @@ UBIFS support add following lines into file ``configs/nokia_rx51_defconfig``::
CONFIG_CMD_UBIFS=y
CONFIG_MTD_UBI_BEB_LIMIT=10
Early output
------------
Early U-Boot output can be enabled on serial console by adding following lines
into file ``configs/nokia_rx51_defconfig``::
CONFIG_DEBUG_UART=y
CONFIG_DEBUG_UART_OMAP=y
CONFIG_DEBUG_UART_SHIFT=2
CONFIG_DEBUG_UART_BASE=0x49020000
CONFIG_DEBUG_UART_CLOCK=48000000
Note that early output is not available on USB tty console.
Verbose debug output
--------------------
Verbose debug output with maximal log level can be enabled by adding following
lines into file ``configs/nokia_rx51_defconfig``::
CONFIG_DM_DEBUG=y
CONFIG_LOG=y
CONFIG_LOGLEVEL=9
CONFIG_LOG_MAX_LEVEL=9
CONFIG_LOG_DEFAULT_LEVEL=9
And compiling U-Boot by additional make parameter ``KCPPFLAGS=-DLOG_DEBUG``.
Run in QEMU
-----------