I am sorry Gerhard, I am newbie to the list. I will keep in mind the etiquette of the list. Thanks for the help.
On Thu, Oct 10, 2013 at 8:37 AM, Gerhard Sittig <g...@denx.de> wrote: > On Wed, Oct 09, 2013 at 09:07 -0700, djoker wrote: >> >> Hi Everyone, > > Why do you "re-send" your request without giving readers time to > respond (first message at 17:00 and second on 09:00 the very next > morning)? > > This unnecessarily splits the same subject across several > threads, hinders discussion and prevents easy lookup in archives > (and reduces your score and thus the willingness to help such a > "demanding" person) ... > >> I have a armv7 board and am looking at the "_start" symbol address, using >> the following command: >> *nm u-boot | grep -w _start* >> >> It returned the following: >> *67000020 T _start* >> >> I couldn't help notice that the the _start value is very "close" in vlaue to >> the value of CONFIG_SYS_TEXT_BASE defined in my board file: >> *#define CONFIG_SYS_TEXT_BASE 0x67000004* > > As with any ARM based CPU, I'd expect the "executable" to start > with a vector table, before the actual body of the start() > routine follows. > > The "reset vector" only has a few bytes in the vector table, and > should consist of a branch to the actual initialization code. > > So I'd rather be baffled if the _start symbol would reside at the > very start of the binary, since it then would clobber all the > vectors. > >> But, I have searched through the source code, but not found where _start >> gets assigned a value.. Could someone please help me understand this ? > > The linker (sometimes referred to as the loader) is the entity to > assign addresses to symbols. So check the linker command line > and control files when in doubt. > > Optionally tell the compiler to "save temp files", and/or check > whether the resulting *.o files or executables match what you'd > expect from looking at the C/assembly source. > > > virtually yours > Gerhard Sittig > -- > DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel > HRB 165235 Munich, Office: Kirchenstr. 5, D-82194 Groebenzell, Germany > Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: off...@denx.de _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot