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boot/edk2: introduce a new _OVMF_DEBUG_ON_SERIAL option

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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>
This commit is contained in:
Julien Olivain
2023-07-21 22:27:57 +02:00
committed by Yann E. MORIN
parent 15cc8d1e45
commit 8e9c8e624f
2 changed files with 22 additions and 0 deletions
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7
boot/edk2/edk2.mk
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@@ -16,8 +16,15 @@ EDK2_INSTALL_IMAGES = YES
ifeq ($(BR2_ENABLE_DEBUG),y)
EDK2_BUILD_TYPE = DEBUG
ifeq ($(BR2_TARGET_EDK2_OVMF_DEBUG_ON_SERIAL),y)
# DEBUG_ON_SERIAL_PORT is only tested to be set, so don't disable it, as
# it would still be set.
EDK2_BUILD_OPTS += -DDEBUG_ON_SERIAL_PORT=TRUE
endif
else
EDK2_BUILD_TYPE = RELEASE
# DEBUG_ON_SERIAL_PORT is only valid in debug builds, so useless to set
# it (enabled or disabled) on a relase build.
endif
# Build system notes.