The following flags are defined for flags1 (flags2
is currently not used):
- STARTUP_HDR_FLAGS1_VIRTUAL
- If this flag is set, the operating system is to run with
the Memory Management Unit (MMU) enabled.
Note:
For this release of the QNX Neutrino RTOS, you should always specify a
virtual system (by specifying the virtual=
attribute in your buildfile, which then sets the
STARTUP_HDR_FLAGS1_VIRTUAL flag).
- STARTUP_HDR_FLAGS1_BIGENDIAN
- The processor is big-endian. Processors should always
examine this flag to check that the ENDIAN is right for
them.
- STARTUP_HDR_FLAGS1_COMPRESS_NONE
- The image isn't compressed.
- STARTUP_HDR_FLAGS1_COMPRESS_ZLIB
- The image is compressed using libz (gzip).
- STARTUP_HDR_FLAGS1_COMPRESS_LZO
- The image is compressed with liblzo.
- STARTUP_HDR_FLAGS1_COMPRESS_UCL
- The image is compressed with libucl. This
is the format chosen when using the [+compress] attribute in
the mkifs build script.
Note:
Currently, the startup-* programs are built to
understand only the UCL compression method. By twiddling the
SUPPORT_CMP_* macro definitions in
startup/lib/uncompress.c, you can change to
one of the other supported compression methods.
The STARTUP_HDR_FLAGS1_COMPRESS_* constants aren't really
flags because they may set more than one bit;
they're used as an enumeration of the types of compression.
Note that both flag flags1 and flags2
are single-byte; this ensures that they're endian-neutral.