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| -rw-r--r-- | docs/user-guide.md | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/docs/user-guide.md b/docs/user-guide.md index 0e9da35d6..29691c5be 100644 --- a/docs/user-guide.md +++ b/docs/user-guide.md @@ -269,6 +269,9 @@ performed. * `BUILD_STRING`: Input string for VERSION_STRING, which allows the TF build to be uniquely identified. Defaults to the current git commit id. +* `CFLAGS`: Extra user options appended on the compiler's command line in + addition to the options set by the build system. + * `COLD_BOOT_SINGLE_CPU`: This option indicates whether the platform may release several CPUs out of reset. It can take either 0 (several CPUs may be brought up) or 1 (only one CPU will ever be brought up during cold reset). @@ -687,11 +690,15 @@ NOTE: Using `-O0` could cause output images to be larger and base addresses might need to be recalculated (see the **Memory layout on ARM development platforms** section in the [Firmware Design]). -Extra debug options can be passed to the build system by setting `CFLAGS`: +Extra debug options can be passed to the build system by setting `CFLAGS` or +`LDFLAGS`: CFLAGS='-O0 -gdwarf-2' \ make PLAT=<platform> DEBUG=1 V=1 all +Note that using `-Wl,` style compilation driver options in `CFLAGS` will be +ignored as the linker is called directly. + It is also possible to introduce an infinite loop to help in debugging the post-BL2 phase of the Trusted Firmware. This can be done by rebuilding BL1 with the `SPIN_ON_BL1_EXIT=1` build flag. Refer to the "Summary of build options" |