On 26 January 2015 at 18:27, Simon Glass sjg@chromium.org wrote:
This came up in a discussion on the mailing list here:
https://patchwork.ozlabs.org/patch/384613/
My concerns at the time were:
- it doesn't need to be written in assembler
- it doesn't need to be ARM-specific
This patch provides a possible alternative. It works by allowing any serial driver to export one init function and provide a putc() function. These can be used to output debug data before the real serial driver is available.
This implementation does not depend on driver model, and it is possible for it to operate without a stack on some architectures (e.g. PowerPC, ARM). It provides the same features as the ARM-specific debug.S but with more UART and architecture support.
Signed-off-by: Simon Glass sjg@chromium.org
Changes in v2:
- Add asmlinkage to exported functions
drivers/serial/Kconfig | 46 ++++++++++++++++ include/debug_uart.h | 139 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 185 insertions(+) create mode 100644 include/debug_uart.h
As discussed let's bring this in.
Applied to u-boot-dm.
(Removed these Kconfig options from minnowmax_defconfig as the same time to avoid a build error. We can always enable it later)