[DragonFlyBSD - Submit #3154] Update serial handling in bootloader

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3154 has been updated by ddegroot.


Excerpt of changes:
General:
- /usr/src/sys/boot makefile fix
- Set default serial console speed to 115200 
- Use stable names/terms in the Makefile ie COMSPEED and BOOT_COMCONSOLE_SPEED

boot0
- Update boot0.S with the newer fbsd version (not sure if this is like/ok)
- If the COMSPEED is set to 0, then don't try to initialize the serial
  port and assume that the BIOS has set it up for us. This allows folks
  with a serial-aware BIOS to set the BIOS to speeds above 9600 and
  allow boot0 to just use the existing settings.
  (freebsd/freebsd at d9d5c6d)
- Allow boot0cfg to force a PXE boot via boot0 on the next boot.
  - Fix boot0 to check for PXE when using the pre-set setting for the
    preferred slice.

boot1
- Use most of the newer fbsd boot1.S (freebsd/freebsd at b730d20)
- Allows you to set the Serial Speed (ie: -S115200)
- Correct line breaks / nicer commandline output when manually entering commands
  - Once the first parameter is entered on the commandline, stop timeout
  - Suppress twiddle when autoboot is off
  - Show current set of flags when making a change
- Allow setting the serial speed (which will also activate RB_SERIAL)
- -D for DUAL makes more sense then -D for Keyboard
- Continue to loader/kernel using an empty commandline (\n) instead of timing out
- Error on unknown flags/cmds
- Move/Reorder some functions
- Use unsigned char / uint8_t to reduce size.

loader
- Reuse the speed already set in boot1
- Allow handling of boot_multicons (currently until loader and not in the kernel (yet))
- Reuse isa_inb/isa_outb from comconsole.c (via extern bootstrap.h)
- Add print RB flags which were passed in (used for debugging)
- Use new cons_probe function
- Updated loader.8 to show change functionality

pxeboot
- Synced with fbsd (freebsd/freebsd at 433bd38)
- Integrate support for tftp and nfs in one pxeloader
  Remove need for loader_tftp and pxeldr_tftp as special versions
  Update man pages accordingly
- Use RB_SERIAL and RB_MULTIPLE (aka boot_multicons) from sys/reboot.h
  when no keyboard was detected (potential false positive).

comconsole
- Handle Multiple/Dual console drivers in a nicer way
- Add extra functionality to comconsole
- Add sleep/usleep definitions

----------------------------------------
Submit #3154: Update serial handling in bootloader
http://bugs.dragonflybsd.org/issues/3154#change-13528

* Author: ddegroot
* Status: New
* Priority: Normal
* Assignee: dillon
* Category: 
* Target version: Latest stable
----------------------------------------
Allow changing serial baud rate in bootloader during boot1/boot2. The speed will automatically be taken over by the loader.

The patch contains multiple changes to improve serial handling through the bootprocess and 
can be found here: https://github.com/DragonFlyBSD/DragonFlyBSD/pull/7





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