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authorSimon Glass <sjg@chromium.org>2015-01-26 18:27:07 -0700
committerSimon Glass <sjg@chromium.org>2015-02-19 06:20:25 -0700
commit2f964aa7b1bf7de50587a1864cf60d187ebefb2c (patch)
tree327538419b445e03d57685b0cce6f518577c42a6 /configs/bf537-pnav_defconfig
parentba25779384671c533a778e53d59fe3f317bfefa8 (diff)
downloadblackbird-obmc-uboot-2f964aa7b1bf7de50587a1864cf60d187ebefb2c.tar.gz
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serial: Support an early UART for debugging
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>
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