diff options
Diffstat (limited to 'c/README.DOS')
| -rw-r--r-- | c/README.DOS | 36 |
1 files changed, 10 insertions, 26 deletions
diff --git a/c/README.DOS b/c/README.DOS index 54a4411a5b..e353c9c50f 100644 --- a/c/README.DOS +++ b/c/README.DOS @@ -36,16 +36,6 @@ will go to a file rather than the screen. The go32 debuggers get confused by the relocated stacks used by tasks, and tend to crash when variables are inspected. -make directory --------------- -gcc-go32.cfg is used for cross compiling to the go32 environment under RTEMS, -while djgcc.cfg is used for "native" compilation; i.e. under MSDOS rather -than under RTEMS. The difference is that "native" compilation uses the djgpp -I/O libraries, while "cross" compilation uses the RTEMS I/O libraries. - -djgcc.cfg is identical to gcc.cfg, except for the omission of the -pipe -option. - djgcc include files ------------------- In general, we use RTEMS include files because these contain the proper @@ -53,23 +43,17 @@ declarations for the libc, and in particular, the stdio functions. When calling go32-specific functions it is necessary to include some djgpp include files, as well. Unfortunately, there are some disagreements between RTEMS and djgpp as to how certain functions and types are -declared. In these cases, I have modified to RTEMS source to special- -case the differences. - -cpu-specific files ------------------- -rtems/c/src/exec/cpu/i80386 is intended to contain 386-specific -functions for RTEMS. Since under djgpp we do not have *complete* -control of the processor, we must cooperate with the djgpp runtime -environment, this directory cannot be shared between the go32 port -and other 386 BSPs. +declared. In these cases, the RTEMS source have been modified to +special-case the differences. other ----- -* F12 will immediately abort the program. -See libbsp/i80386/go32/iosupp/inch.c. +* Pressing F12 will immediately abort the program. +See lib/libbsp/i386/go32/console/inch.c. + +* lib/libbsp/i386/go32/timer uses the on-board timer chip by default, +which has a resolution of about 1 microsecond. However, if executing +on a Pentium processor you can use the on-chip 64-bit cycle counter, +which counts at whatever clock rate your processor runs at. To enable +this, set RTEMS_CPU_MODEL=pentium in make/custom/go32.cfg. -* libbsp/i80386/go32/timer uses the on-board timer chip by default. -However, if executing on a Pentium processor you can use the on-chip -64-bit cycle counter, which counts at whatever clock rate your processor -runs at. To use this, compile with -DPENTIUM |