[build] Generalise CONSOLE_VESAFB to CONSOLE_FRAMEBUFFER
The name "vesafb" is intrinsically specific to a BIOS environment.
Generalise the build configuration option CONSOLE_VESAFB to
CONSOLE_FRAMEBUFFER, in preparation for adding EFI framebuffer
support.
Existing configurations using CONSOLE_VESAFB will continue to work.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[int13con] Add basic ability to log to a local disk via INT 13
Several popular public cloud providers do not provide any sensible
mechanism for obtaining debug output from an OS which is failing to
boot. For example, Amazon EC2 provides the "Get System Log" facility,
which occasionally deigns to report a random subset of the characters
emitted via the VM's serial port, but usually returns only a blank
screen. (Amazingly, this is still superior to the debugging
facilities provided by Azure.)
Work around these shortcomings by adding a console type which sends
output to a magically detected raw disk partition, and including such
a partition within any iPXE .usb-format image.
To use this facility:
- build an iPXE .usb image with CONSOLE_INT13 enabled
- boot the cloud VM from this image
- after the boot fails, attach the VM's boot disk to a second VM
- from this second VM, use "less -f -R /dev/sdb3" (or similar) to
view the iPXE output.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[build] Allow for named configurations at build time
Allow named configurations to be specified via the CONFIG=... build
parameter. For headers in config/*.h which support named
configurations, the following files will be included when building
with CONFIG=<name>:
- config/defaults/<platform>.h (e.g. config/defaults/pcbios.h)
- config/<header>.h
- config/<name>/<header>.h (only if the directory config/<name> exists)
- config/local/<header>.h (autocreated if necessary)
- config/local/<name>/<header>.h (autocreated if necessary)
This mechanism allows for predefined named configurations to be
checked in to the source tree, as a directory config/<name> containing
all of the required header files.
The mechanism also allows for users to define multiple local
configurations, by creating header files in the directory
config/local/<name>.
Note that the config/*.h files which are used only to configure
internal iPXE APIs (e.g. config/ioapi.h) cannot be modified via a
named configuration. This avoids rebuilding the entire iPXE codebase
whenever switching to a different named configuration.
Inspired-by: Robin Smidsrød <robin@smidsrod.no>
Tested-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The VESA frame buffer console uses the VESA BIOS extensions (VBE) to
enumerate video modes, selects an appropriate mode, and then hands off
to the generic frame buffer code.
The font is extracted from the VGA BIOS, avoiding the need to provide
an external font file.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[console] Add "log message" console usage and an internal syslog() call
Provide an internal syslog() function (unrelated to the syslog
console) which can be used to create log messages with specified
priorities.
The build-time constant LOG_LEVEL can be used to select the minimum
required priority for log messages. Any messages that do not have a
sufficient priority will be ignored (and will be optimised away at
compile-time).
The default LOG_LEVEL is LOG_NONE.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Include config/local/$file in config/$file where it makes sense and
create empty local configs during build if not present.
Modified-by: Michael Brown <mcb30@etherboot.org>
Signed-off-by: Michael Brown <mcb30@etherboot.org>
Michael Brown