On 08/03/2016 10:17 AM, Georg-Johann Lay wrote:
Index: doc/extend.texi
===================================================================
--- doc/extend.texi (revision 238983)
+++ doc/extend.texi (working copy)
@@ -5957,6 +5957,25 @@ memory-mapped peripherals that may lie o
volatile int porta __attribute__((address (0x600)));
@end smallexample
+@item absdata
+@cindex @code{absdata} variable attribute, AVR
+Variables in static storage and with the @code{absdata} attribute can
+be accessed by the @code{LDS} and @code{STS} instructions which take
+absolute addresses.
+
+@itemize @bullet
+@item
+This attribute is only supported for the reduced AVR Tiny core
+like @code{ATtiny40}.
+
+@item
+There is currently no Binutils support for this attribute and the user has
+to make sure that respective data is located into an address range that
+can actually be handled by @code{LDS} and @code{STS}.
+This applies to addresses in the range @code{0x40}@dots{}@code{0xbf}.
The wording here is a little awkward -- in particular, "the user" is
really "you", the reader of the manual. How about something like this
instead?
@item
You must use an appropriate linker script to locate the data in the
address range accessible by @code{LDS} and @code{STS}
(@code{0x40}@dots{}@code{0xbf}).
-Sandra
