Commit 4bf95a9f361e ("MdeModulePkg/ResetSystemRuntimeDxe: Add more debug
message") broke the DEBUG build for systems using a MMIO mapped UART for
DEBUG output. In other words, it broke the build for all ARM and AARCH64
systems, given that port I/O does not exist on those architectures.
Instead of patching it up locally, let's fix this issue once and for all,
by creating a UART DebugLib implementation for DXE_RUNTIME_DRIVER modules
that does the right thing by default.
v3:
- revert PCD changes, as they are unnecessary for the PCDs in question (since
they are fixed or patchable only)
- drop redundant mEfiAtRuntime checks around ASSERT()s
- revert whitespace cleanup, i.e., move back to BaseDebugLibSerialPort origin
for most of the file
v2:
- incorporate Laszlo's feedback into patch #1
- add Laszlo's R-b to patch #2
- dropped patch #3 that blacklists the original BASE implementation for
DXE_RUNTIME_DRIVER modules
Note that I retained the deadloop/breakpoint code for ASSERT()s at runtime.
I think it is perfectly reasonable behavior for a DEBUG build at runtime,
even if other cores may be up and running as well: the purpose of these
facilities is to allow a debugger to attach to the CPU to figure out what
has happened, and both deadloops and breakpoints can achieve that just
fine even at runtime.
Ard Biesheuvel (2):
MdePkg: introduce DxeRuntimeDebugLibSerialPort
ArmVirtPkg: switch to DXE runtime version of DebugLib where
appropriate
ArmVirtPkg/ArmVirt.dsc.inc |
3 +
MdePkg/Library/DxeRuntimeDebugLibSerialPort/DebugLib.c |
346 ++++++++++++++++++++
MdePkg/Library/DxeRuntimeDebugLibSerialPort/DxeRuntimeDebugLibSerialPort.inf |
55 ++++
MdePkg/Library/DxeRuntimeDebugLibSerialPort/DxeRuntimeDebugLibSerialPort.uni |
21 ++
4 files changed, 425 insertions(+)
create mode 100644 MdePkg/Library/DxeRuntimeDebugLibSerialPort/DebugLib.c
create mode 100644
MdePkg/Library/DxeRuntimeDebugLibSerialPort/DxeRuntimeDebugLibSerialPort.inf
create mode 100644
MdePkg/Library/DxeRuntimeDebugLibSerialPort/DxeRuntimeDebugLibSerialPort.uni
--
2.11.0
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