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In upstream libfdt, 6dcb8ba4 "libfdt: Add helpers for accessing unaligned words" introduced changes to support unaligned reads for ARM platforms and 11738cf01f15 "libfdt: Don't use memcpy to handle unaligned reads on ARM" improved the performance of these helpers. In practice however, this only occurs when the user has forced the device tree to be placed in memory in a non-aligned way, which in turn violates both our rules and the Linux Kernel rules for how things must reside in memory to function. This "in practice" part is important as handling these other cases adds visible (1 second or more) delay to boot in what would be considered the fast path of the code. Cc: Patrice CHOTARD <patrice.chotard@st.com> Cc: Patrick DELAUNAY <patrick.delaunay@st.com> Link: https://www.spinics.net/lists/devicetree-compiler/msg02972.html Signed-off-by: Tom Rini <trini@konsulko.com> Tested-by: Patrice Chotard <patrice.chotard@st.com>
The libfdt functionality was written by David Gibson. The original source came from the Git repository: URL: git://ozlabs.org/home/dgibson/git/libfdt.git author David Gibson <dgibson@sneetch.(none)> Fri, 23 Mar 2007 04:16:54 +0000 (15:16 +1100) committer David Gibson <dgibson@sneetch.(none)> Fri, 23 Mar 2007 04:16:54 +0000 (15:16 +1100) commit 857f54e79f74429af20c2b5ecc00ee98af6a3b8b tree 2f648f0f88225a51ded452968d28b4402df8ade0 parent 07a12a08005f3b5cd9337900a6551e450c07b515 To adapt for U-Boot usage, only the applicable files were copied and imported into the U-Boot Git repository. Omitted: * GPL - U-Boot comes with a copy of the GPL license * test subdirectory - not directly useful for U-Boot After importing, other customizations were performed. See the "git log" for details. Jerry Van Baren