doc: Replace DocBook with sphinx-based docs

The Linux kernel moved to sphinx-based documentation and got rid of the
DocBook based documentation quite a while ago. Hence, the DocBook
documentation for U-Boot should be converted as well.

To achieve this, import the necessary files from Linux v4.17, and
convert the current DocBook documentation (three files altogether) to
sphinx/reStructuredText.

For now, all old DocBook documentation was merged into a single
handbook, tentatively named "U-Boot Hacker Manual".

For some source files, the documentation style was changed to comply
with kernel-doc; no functional changes were applied.

Signed-off-by: Mario Six <mario.six@gdsys.cc>

1 files changed, 2 insertions, 0 deletions

diff --git a/Documentation/.gitignore b/Documentation/.gitignore
new file mode 100644
index 0000000000..e74fec8693
--- /dev/null
+++ b/Documentation/.gitignore
@@ -0,0 +1,2 @@
+output
+*.pyc