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When EDK2 OVMF is built with debug, messages are printed to IO port 0x402. Those messages are not shown in the normal Qemu emulated serial port. Enabling this option will print debug messages on the emulated serial port, potentially mixing messages with UEFI serial console output. See OVMF README: https://github.com/tianocore/edk2/blob/master/OvmfPkg/README This option has been useful to debug problems such as [1], in which the emulator was hanging at startup without any log. Enabling this option show the debug message on the console, before hanging: ... PlatformCpuCountBugCheck: Present=0 Possible=1 PlatformCpuCountBugCheck: Broken CPU hotplug register block found. Update QEMU to version 8+, or PlatformCpuCountBugCheck: to a stable release with commit dab30fbef389 backported. Refer to PlatformCpuCountBugCheck: <https://bugzilla.tianocore.org/show_bug.cgi?id=4250>. ... [1] http://lists.busybox.net/pipermail/buildroot/2023-July/670807.html Signed-off-by: Julien Olivain <ju.o@free.fr> Tested-by: Romain Naour <romain.naour@gmail.com> Reviewed-by: Romain Naour <romain.naour@gmail.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches