Debian Linux for KISS-68030

To make this work:

 - configure your MF-PIC at a base address of 0x40 (which is the standard
   setting). 

 - fit as much RAM as possible. I suspect 16MB is the minimum required to boot
   to multiuser.

 - fast CPU recommended.

 - get an 8GB or larger Compact Flash card, and write the disk image to it:
     bunzip -dc 2016-02-20-kiss68030-hddimage.dd.bz2 | dd bs=1M of=/dev/sdX 
   where /dev/sdX is the name of your CF card (note: the whole card, not a
   partition on it, ie /dev/sde instead of /dev/sde1). The Compact Flash 
   card contains:
    - First partition (128MB): A FAT format filesystem, used by the boot ROM. 
    - Second partition (about 7GB): An ext4 format filesystem, used by Linux.
    - Third partition (1GB): Swap space for Linux. Try to avoid using this!

 - Connect the CF card to the IDE port on the MF-PIC.

 - write "kissbios.rom" to your ROM chip -- I have padded the file to 512KB to
   make this easier, however only the first 46KB is actually used so you could
   use a smaller flash ROM chip if you need to (this is untested)

 - set your terminal to 115200 baud, 8 bit data, no parity, 1 stop bit, and
   enable RTS/CTS hardware flow control.

 - power on the system. On the first boot you will want to run Setup by
   pressing "s" immediately on power-on. Enable IDE Board Type 1 ("Parallel
   Port") at Base port address 44 hex. Then on rebooting the system it should
   run the ROM. This should detect the CF card, find "boot.cmd" on it, and boot
   it automatically after 1--2 seconds. 
   
 - Linux should boot and after about 10 minutes you should be able to log in with
   username "root", password "root".

 - Useful tricks:
     rz, sz     -- Z-Modem file transfer through console
     screen     -- Run multiple sessions on one terminal (read the man page)
     flash030   -- Reprogram the flash ROM in-system
     nice       -- Run a program with reduced CPU priority

 - When you're finished, type "halt".

Source code and build environment:

 - Source code for the Linux kernel, boot ROM and flash030 is all in the /root/
   directory on the Linux filesystem. The filesystem image includes all the
   tools to build these on the KISS-68030 system itself, or you can
   cross-compile on a faster machine.

Notes on the ROM:

 - It is only really useful with a CF card present.

 - If a file named "boot.cmd" is present it will be used as a list of commands
   to automatically boot the system.

 - If "boot.cmd" is not present the system will drop to the ROM command line
   rather than automatically booting.

 - Pressing "x" or "s" quickly after reset will drop to the command line or
   enter setup, respectively. Note that any other key will skip the delay and
   automatically boot immediately.

 - At the ROM command line:

   - If you have multiple disks, 0:, 1:, 2:, 3: etc will switch between them

   - "cd" will change directory

   - "ls" or "dir" will list the directory.

   - typing a file name will try to load it as a program: 
   
     - COFF or ELF executables are supported. A single argument of "u" or "s"
       will cause the program to run in user or supervisor mode, respectively:
       "myprog.elf u"

     - Linux kernels are supported. Arguments are passed to the kernel verbatim,
       with the exception of "initrd=<filename>" which can be given to load an
       initrd image into memory for the kernel:
       "vmlinux.elf initrd=initrd.img console=ttyS0,115200n8r init=/bin/bash"

     - Any other arbitrary file can be loaded by giving the load-address as
       address (in hex):
       "myprog.bin 1000"

   - "execute <addr> [u|s]" will jump to a given address in user or supervisor
     mode.

   - "writemem <addr> <byte...>" will write to a given address in memory. You
     can use "wm" as a shorthand.

   - "dump <addr> <count>" will dump the contents of the specified region of
     memory in hex and ASCII. You can use "dm" as a shorthand.

kiss68030_ide_data_input:
    moveal %sp@(4),%a0          /* void *buf */
    moveal %sp@(12),%a1         /* 8255 base address */
    movel %sp@(8),%d1           /* int dwords */

    /* save registers */
    movem.l %d2-%d3/%a2,-(%sp)
    
    lea %a1@(3),%a2             /* 8255 control register */
    moveq #13, %d2
    moveq #12, %d3

    /* skip to the end - to test for dwords=0 */
    jbra ide_input_loop

ide_input_nextword:
    /* read a DWORD */
    moveb %d2, %a2@             /* begin /RD pulse */
    movew %a1@, %d0             /* reads LSB then MSB in that order */
    moveb %d3, %a2@             /* end /RD pulse */
    swap %d0                    /* move to the top half of the word */
    moveb %d2, %a2@             /* begin /RD pulse */
    movew %a1@, %d0             /* reads LSB then MSB in that order */
    moveb %d3, %a2@             /* end /RD pulse */

    /* store to memory */
    movel %d0, %a0@+

    /* loop until done */
ide_input_loop:
    dbra %d1, ide_input_nextword

    /* restore registers, return */
    movem.l (%sp)+,%d2-%d3/%a2
    rts


kiss68030_ide_data_output:
    moveal %sp@(4),%a0          /* void *buf */
    moveal %sp@(12),%a1         /* 8255 base address */
    movel %sp@(8),%d1           /* int dwords */

    /* save registers */
    movem.l %d2-%d3/%a2,-(%sp)
    
    lea %a1@(3),%a2             /* 8255 control register */
    moveq #11, %d2
    moveq #10, %d3

    /* note that to give the drive time to latch the data we do
       housekeeping including swaps and branches while the /WR
       line is asserted -- so the first thing we do each loop is
       end the previous cycle's /WR pulse, which is a NOP on the
       entry to the first loop */

    /* skip to the end - to test for dwords=0 */
    jbra ide_output_loop
ide_output_nextword:
    /* load from memory */
    movel %a0@+, %d0
    /* write a DWORD */
    moveb %d3, %a2@             /* end /WR pulse -- nop on the first loop*/
    swap %d0                    /* top half first */
    movew %d0, %a1@             /* set up data lines */
    moveb %d2, %a2@             /* begin /WR pulse */
    swap %d0                    /* get the bottom half */
    moveb %d3, %a2@             /* end /WR pulse */
    movew %d0, %a1@             /* set up data lines */
    moveb %d2, %a2@             /* begin /WR pulse */
    /* loop until done */
ide_output_loop:
    dbra %d1, ide_output_nextword

    moveb %d3, %a2@          /* end the final /WR pulse */

    /* restore registers, return */
    movem.l (%sp)+,%d2-%d3/%a2
    rts

root@darkstar:~# wget sowerbutts.com
--2016-03-04 22:11:33--  http://sowerbutts.com/
Resolving sowerbutts.com (sowerbutts.com)... 195.149.84.65
Connecting to sowerbutts.com (sowerbutts.com)|195.149.84.65|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2188 (2.1K) [text/html]
Saving to: 'index.html'

index.html            0%[                    ]       0  --.-KB/s    in 0s

2016-03-04 22:11:33 (0.00 B/s) - Read error at byte 0/2188 (Invalid argument). Retrying.

   IRQ   DEVICE
    0    UART1 
    1    4UART A (future)
    2    4UART B (future)
    3    4UART C (future)
    4    4UART D (future)
    5                    
    6
    7    IDE1        <-- moved (was previously IRQ 1)
    8                                                
    9    IDE0
   10    TIMERH      <-- highest priority (then 11, 12, ... 15, 0, 1, ... 9 is lowest)
   11
   12    UART0
   13
   14
   15    TIMERL (unused. IRQ11 may be a better choice; software configurable)

--- linux-4.5/drivers/tty/serial/8250/8250_port.c	2016-03-14 04:28:54.000000000 +0000
+++ linux-4.5-kiss/drivers/tty/serial/8250/8250_port.c	2016-03-28 17:55:45.580249260 +0100
@@ -2309,8 +2309,12 @@
 	 */
 	if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) {
 		up->mcr &= ~UART_MCR_AFE;
-		if (termios->c_cflag & CRTSCTS)
+		port->status &= ~UPSTAT_AUTOCTS;
+
+		if (termios->c_cflag & CRTSCTS) {
 			up->mcr |= UART_MCR_AFE;
+			port->status |= UPSTAT_AUTOCTS;
+		}
 	}
 
 	/*