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authorUwe Hermann <uwe@hermann-uwe.de>2007-02-17 16:24:41 +0000
committerUwe Hermann <uwe@hermann-uwe.de>2007-02-17 16:24:41 +0000
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Move HOWTO/ into documentation/ where it belongs (trivial).
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2555 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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+
+This HOWTO contains instructions for using LinuxBIOSv2 on the VIA EPIA-M and MII
+mini-itx based motherboards.
+
+Version 1.0 initial write for LinuxBIOSv2 by Nick Barker
+
+Using materials and inspiration from
+- EPIA HOWTO for freebios/linuxbios by Mark Wilkinson
+- Based on the K7SEM HOWTO by Brenden Bixler,
+- which is based on the Sis 630 HOWTO by Ron Minnich.
+- Getting Started with freebios2 - a mail posting by Jay Miller
+
+Unfortunately, there is a step in this HOWTO that could be hazardous. The
+hazards include (but are not limited to)
+ 1) destroying your motherboard
+ 2) hurting yourself
+ 3) killing yourself
+
+Because of these hazards, you must take full responsibility if you
+decide to install LinuxBIOSv2 following these procedures. Neither the
+author of this HOWTO or any organisation or individual associated with
+the LinuxBIOSv2 project can be held responsible for any adverse consequences
+of your attempt to follow these procedures.
+
+WARNING: We assume you've built kernels, know how to open up your PC,
+and how to yank the flash part out while power is on and put in a
+different part. There is NO WARRANTY, express or implied, with this
+software. In fact, if you don't know what you're doing, and you get
+careless, you're going to end up with a nice paperweight instead of a
+motherboard, an emergency room bill, or a funeral service.
+
+ YOU HAVE BEEN WARNED.
+
+Additional information available at: http://www.linuxbios.org/
+
+Linux distribution: Most modern distributions are supported.
+
+Other software notes: You MUST have 'as' version 2.9.5 or later.
+ You MUST have 'gcc' version other than 2.96.
+
+
+Pre-requisites
+--------------
+
+Before you start there are a few things which you need to arrange:
+
+Since you are going to be re-programming the flash rom on the mainboard, and
+it is likely that you first few attempts / images will not be right, then
+you need a way of restoring a known working bios onto a board which is otherwise
+dead.
+
+Recommended: you might want to get a Bios Saviour (RD1-PL) - this is
+a handy little piggy-back flash chip that saves you destroying the original
+flash image. This howto assumes that you have this device, though other methods
+and devices exist for programming flash roms.
+
+LinuxBIOSv2 sends debugging output through the first serial port. You might want
+to arrange a null modem serial cable for connecting this serial port to a
+second computer running a terminal emulation program. I use 'microcom' which
+is simple and allows all output to be captured into a file for later analysis.
+The port is set up to use 115200 baud, 8bit, No parity, 1 stop bit.
+
+Under LinuxBIOSv2 you have a choice of 'payloads'. The payload is the program
+which LinuxBIOSv2 hands over to once it has finished initialising everything
+on the mainboard at boot time. The payload is included in the flash rom along
+with LinuxBIOSv2, and usually its function is to locate and load the operating
+system. The 2 most common payloads are FILO, for booting Linux off an IDE
+disk, and Etherboot for booting a diskless workstation accross a network.
+This howto assumes the use of FILO.
+
+A vga bios image. LinuxBIOS2v2 uses the vga bios of the original Via BIOS to
+initialise the vga. It is not directly downloadable, but you can capture it from
+a system running with the original bios, so you might as well capture it now:
+ dd if=/dev/mem of=/video.bios.bin \
+ bs=1 count=65536 skip=790528
+
+
+Getting Going
+-------------
+
+The steps for loading LinuxBIOSv2 are simple:
+1) Get Linux installed on your machine.
+2) Download and install LinuxBIOSv2 sources.
+3) Understand how to flash your rom.
+4) Download, Configure and build the FILO payload
+5) Configure and build LinuxBIOSv2.
+6) Burn the LinuxBIOSv2 image to the flash.
+7) Reset the machine -- did it work?
+
+Options Once it has booted
+ i) Speeding up the boot
+ ii) Enhancing ACPI support
+iii) On EPIA-MII, booting the computer from on-board compact flash
+
+
+Step 1)
+ Get Linux installed on your LinuxBIOSv2 machine.
+ Don't forget to note which partition is / (/dev/hda3 etc.)
+
+
+Step 2)
+ Grab the LinuxBIOSv2 source.
+ cd to the directory you want the source tree to be.
+
+ Note: this will create a sub directory called LinuxBIOSv2 which contains
+ the LinuxBIOSv2 source code
+
+ Download the latest code for LinuxBIOSv2 from the downloads page at
+ http://www.linuxbios.org
+
+
+ having expanded the tarball, cd into the LinuxBIOSv2 directory and browse around.
+ The top level directory includes:
+
+ 'src' - where all of the source files for LinuxBIOSv2 are located.
+ 'targets' - where all of the platform specific configuration files
+ for each platform supported by LinuxBIOSv2 are kept, and
+ where the build files and build process occur.
+ 'util' - where various utilities required for the build process
+ and debugging are kept.
+
+
+ Hereafter, this howto refers to directory locations relative to these directories,
+ unless an absolute pathlist is given.
+
+Step 3)
+ Whilst getting LinuxBIOSv2 going on your EPIA-M, you are almost
+ certainly going to be re-programming the flash rom several times, and
+ there is a very high probability that at one of these stages you will
+ get a flash rom that fails to boot your mainboard into Linux.
+
+ Before we proceed any further, it is absolutley vital that you have
+ worked out how to program the flash chip, and how you are going to
+ get back to your original bios when things go wrong. Otherwise you
+ will end up with a very expensive paper weight as described earlier.
+
+ You can use a professional Data I/O burner, or you can be foolhardy
+ and simply re-program the flash part of a running machine. However
+ whilst getting going a BIOS SAVIOUR RD1-PL is a very inexpensive
+ but effective device for ensuring that you always have a working
+ BIOS to hand.
+
+ The bios saviour is a little device which plugs into the flash rom
+ socket of the motherboard, and the original flash rom then plugs into
+ the bios saviour. The bios saviour includes a second flash rom chip,
+ and either of these chips can be selected as the active chip by a
+ simple supplied electrical switch mounted on flying leads. Make
+ sure that this switch is clearly visible, so that you know which
+ chip you are booting from, and which chip you are about to re-program.
+
+ Decide which chip you are going to use for LinuxBIOSv2, and which chip
+ you are going to keep the original working bios in, and mark them
+ clearly on this switch.
+
+ In the 'util/flash_and_burn' directory is the source for the 'flash_rom'
+ utility, which is great for re-programming the flash chips on the
+ EPIA-M / MII. Once you have built this utility:
+
+ Make sure that it can detect both flash chips on the bios saviour:
+ with switch set to chip 1 run 'flash_rom'
+ flash rom should search through a list of known flash rom
+ device types until it finds the type of the original chip
+ from your EPIA-M, and report what it has found.
+
+ with the switch set to chip 2, run 'flash_rom' again and confirm
+ that it can 'see' the second flash chip.
+
+ If your are lucky, the actual part number of the 2 chips may
+ be different, which you can use just prior to re-programming
+ a chip to make sure you are programming the right chip.
+
+ Make sure that you can read / write and verify a flash chip:
+ with switch set to 1 (original BIOS) run
+ 'flash_rom -r original.rom'
+ this should read the contents of the original bios into the
+ file original.rom
+
+ confirm that the newly read file matches the original bios
+ 'flash_rom -v original.rom'
+
+ set the switch to 2
+ confirm if you can that flash_rom 'sees' the second chip
+ 'flash_rom' - and look for the detected device type
+
+ write the known good bios to the second chip with
+ 'flash_rom -w original.bios'
+
+ verify that it has written correctly
+ 'flash_rom -v original.rom'
+
+ with switch left at position 2, reboot the machine and make
+ sure that it comes up corectly. If it does then you now have
+ a working flash programming environment. If it does not, then
+ set the switch back to 1, reboot the machine, and investigate
+ further.
+
+Step 4)
+ Download FILO from http://felixx.tsn.or.jp/~ts1/filo, and expand
+
+ In the FILO source directory, type 'make'
+
+ The first invocation of make builds the default Config file, which
+ should be edited to meet your needs. In particular look at the line:
+
+ "AUTOBOOT_FILE ...."
+
+ and make sure that it looks sensible for your setup. The line
+ AUTOBOOT_FILE "hda1:/vmlinuz root=/dev/hda2 console=ttyS0,115200"
+ reads as:
+ - find a linux os image on device hda partion 1 called vmlinuz,
+ - load this image
+ - execute the image passing kernel command line parameters of:
+ "root=/dev/hda2 console=ttyS0,115200"
+
+ after editing Config, type 'make' again, and this will build the file
+ 'filo.elf' which is the payload we will be using.
+
+ Copy this file to somewhere which the LinuxBIOSv2 makefile can easily
+ find it. I just tend to keep it in the root directory though I'm sure
+ others will condem me for that practise:
+ 'cp filo.elf /'
+
+ Make sure that you have compiled a kernel bzImage, and copied it to
+ the file location you identified in the FILO Config file.
+
+
+Step 5)
+ The next step is to create the build environment for the epia-m. This
+ step creates the appropriate makefiles and build directories for the
+ epia-m.
+
+ 'cd targets'
+ './buildtarget via/epia-m'
+
+ This step will create a subdirectory in the targets/via/epia-m
+ directory called epia-m, which is the build directory for LinuxBIOSv2.
+
+ The main configuration file for the epia-m is in
+ 'targets/via/epia-m/Config.lb'
+
+ If you need to make any changes to the configuration, for example you wish to
+ locate filo.elf in a place other than '/filo.elf', or during the more advanced
+ steps of this HOWTO, then these changes are made to this file.
+
+ You need to re-run the './buildtartegt via/epia-m' after any such change.
+
+ The directory 'targets/via/epia-m' contains other sample Config.lb files, any
+ of which can be copied through to Config.lb in order to become the current
+ configuration.
+
+ Once you have your Config.lb set up to your needs, and the build environment
+ created with './buildtarget', it is time to build a rom image.
+
+ Change directory into the build directory 'targets/via/epia-m/epia-m'
+
+ The configuration as set up by the buildtarget process will create a LinuxBIOS
+ which is exactly 196608 bytes long, which is exactly 64K bytes short of what
+ needs to go into the 256K flash rom. The other 64K is for your vga bios
+ which is simply merged with the linuxbios image. The easiest way to make this
+ happen is to edit the Makefile and change the line
+
+ cat fallback/linuxbios.rom > linuxbios.rom
+
+ to
+
+ cat /video.bios.bin fallback/linuxbios.rom >linuxbios.rom
+
+ Note: the above order of merging the files together is critical
+
+ You will need to remember to make this change every time after you have run
+ the buildtarget program.
+
+ Type 'make', and wait for the build process to complete.
+
+ If all went well, then you should find a file 'linuxbios.rom' in your
+ current directory. Check that it is 262144 bytes long - i.e. exactly the right
+ size for the flash rom chip in your EPIA-M / MII.
+
+
+
+Step 6)
+ NOTE: BE ADVISED THAT THIS STEP CAN KILL YOUR MOTHERBOARD !
+ IF YOU DO NOT HAVE A MEANS OF RECOVERING FROM FLASHING YOUR BIOS,
+ YOU MAY/WILL BE LEFT WITH A DEAD MACHINE.
+
+
+ Assuming that you are using a Bios Saviour, make sure that the switch is set
+ to the position for your LinuxBIOSv2 image.
+
+ Type 'flash_rom' to make sure it can see the flash chip, and verify its type if
+ possible.
+
+ Only once you are happy that you are about to re-programme the desired chip, type
+ 'flash_rom -w linuxbios.rom', and wait the few seconds it takes to program it.
+
+ Once it has finished, verify that the chip was re-rogrammed correctly - type
+ 'flash_rom -v linuxbios.rom'
+
+
+
+Step 7)
+ Power cycle the machine. LinuxBIOSv2 should come up in a few seconds.
+
+ With a connection to the serial port set at 115200, you should see LinuxBIOSv2
+ come up, launch FILO, and if you have a timeout set in FILO, then it may be
+ waiting for you to confirm its boot command line.
+
+ As long as you have this command line set up correctly, and an os image in the
+ right place, then FILO should proceed to boot into your Linux os.
+
+ If you do, CONGRATULATIONS ! It WORKED ! Pat yourself on the back,
+ why not try the optional steps now ?
+
+ If you don't, time to start capturing the output of the serial port
+ and talking to the linuxbios mailing list.
+
+
+Optional steps - for use only if step 7 was successfull.
+
+OK so now we have a BIOS which boots your computer fully into the operating system, and
+depending upon your needs that may be all that you want. However LinuxBIOSv2 has a few more
+tricks up its sleeve should you find yourself hungry for more.
+
+Speeding up the boot
+--------------------
+
+Linuxbios sends its debugging output to the first serial port and, depending upon the amount of debug
+output selected, can be the limiting factor in the speed with which it boots your computer - regardless
+of whether you have anything attached to the serial port.
+
+Linuxbios uses the notion of debug levels to control what is sent to the serial port. These levels
+range from 0 to 9 with 0 being the least verbose and 9 being the most verbose.
+
+These levels are defined in the Config.lb file described earlier. To reduce the output set:
+ option MAXIMUM_CONSOLE_LOGLEVEL=8
+ option DEFAULT_CONSOLE_LOGLEVEL=8
+to lower values.
+
+Next you will have to run 'buildtarget' again to propagate the effects of the config change.
+Then edit your Makefile again to include your video bios in the final merging.
+
+Then run 'make clean' followed by 'make'.
+
+
+Advanced ACPI
+-------------
+
+ LinuxBIOSv2 now supports ACPI on the epia-m and epia-m II. In particular the interrupt
+ processing in Linux can be done through ACPI, and crude power management support
+ is provided. This includes software power off, and power management events from the
+ power button.
+
+ It is possible to enhance this behaviour to provide the full capabilities of the
+ original BIOS, which includes different sleep levels and wake from these levels
+ upon certain events. This is achieved by using a 'grabbed' copy of the ACPI
+ Differentiated System Descriptor Table or DSDT from the original BIOS.
+
+ For copyright reasons this table cannot be included with the source distribution
+ of LinuxBIOSv2.
+
+
+ You MUST have 'iasl' - Intel's ACPI Asl compiler for Unix/Linux -
+ http://developer.intel.com/technology/iapc/acpi/downloads.htm.
+
+
+ To replace the LinuxBIOSv2 DSDT with the grabbed one from the original BIOS:
+
+ - Start the computer using the original BIOS, and make sure that you
+ have ACPI set up in the kernel that you are running
+
+ - Grab the DSDT table - 'cat /proc/acpi/dsdt >dsdt.aml'
+ - Convert to asl code - 'iasl -d dsdt.aml' (creates dsdt.dsl)
+ - Convert it to a C hex table - 'iasl -tc dsdt.dsl' (creates dsdt.hex)
+ - Replace the file 'src/mainboard/via/epia-m/dsdt.c with dsdt.hex
+
+ Now re-build LinuxBIOSv2, re-program the flash and power cycle.
+
+ If you wish to return to the LinuxBIOSv2 DSDT, then the original file dsdt.asl can be converted
+ into a C hex file using 'iasl -tc dsdt.asl'
+
+
+
+Boot from Onboard Compact Flash (MII only)
+------------------------------------------
+
+ LinuxBIOSv2 now supports the onboard compact flash on the MII as an IDE drive,
+ and it is possible to boot directly from this drive using the following steps.
+
+ The first step is to get Filo or whatever payload you are using to recognise
+ and use this device.
+
+ In order that the pcmcia subsystem of the Linux kernel can correctly configure
+ the device later on in the boot process the CF is set up with its I/O
+ registers in a contiguous block of 16 bytes at 0x1e0 through 0x1ef. Unfortunately
+ this is not a standard IDE address which is why we need to 'fix' filo to use it.
+ (Actually it is half of the address range used by IDE4, and so we need to
+ be careful to tell the kernel not to probe that address - more on that later).
+
+ The first step is to change the filo Config file.
+ 1) Comment out SUPPORT_PCI=1. This line instructs filo to search for PCI based IDE
+ adapters only, and the CF is not attached to a PCI based IDE controller.
+ 2) Add the following two lines somewhere in the Config file:
+ IDE2_CMD = 0x1e0
+ IDE2_CNTRL =0x1ec
+
+
+ The second step is to modify the file drivers/ide.c in the filo source directory.
+ Find the function 'find_ide_controller_compat' and change it to look like
+
+ static int find_ide_controller_compat(struct controller *ctrl, int index)
+ {
+ if (index >= IDE_MAX_CONTROLLERS)
+ return -1;
+ #ifdef IDE2_CMD
+ if(index == 2){
+ ctrl->cmd_base = IDE2_CMD;
+ ctrl->ctrl_base = IDE2_CNTRL;
+ return 0;
+ }
+ #endif
+ ctrl->cmd_base = ide_base[index];
+ ctrl->ctrl_base = ide_base[index] + IDE_REG_EXTENDED_OFFSET;
+ return 0;
+ }
+ Filo will now recognise the CF as the first device on the third IDE controller
+ (i.e. ide2), and can be referred to as 'hde'
+
+
+ The next step is to create an initrd file for your Linux kernel. What? Why?
+ The CF socket on your MII is hardwired to the PCMCIA controller and for all intents
+ and purposes it is a PCMCIA device. This means that once Linux boots it will be under
+ the control of the pcmcia manager. Now according to the pcmcia-utils documentation,
+ the pcmcia manager is intended to control and configure devices on an already
+ running system. Yet if we need the CF to be the root device, it needs to be mounted
+ very early on in the boot sequence, before the stage where pcmcia devices would normally
+ be configured. The answer is to use an initrd file to get the pcmcia manager running early
+ for the CF. If you are unfamiliar with initrd then 'man initrd' will give you more background.
+
+
+ The easiest way to create an initrd is to use the script 'mkcfinitrd' which is at the bottom
+ of this howto. This is a tailored version of the 'pcinitrd' script from the pcmcia-utils package.
+ Make sure that 'ash' is available on your system as this is the tiny shell programme used during
+ the initrd phase of booting.
+
+ It is worth mounting the initrd generated, and looking over it to make sure that
+ it contains all of the modules necessary to load and initialise the CF. It does not
+ need drivers for whatever you use in the pcmcia socket, as that can be initialised
+ later on in the boot process as before.
+
+ Finally gzip the file created, and move it alongside your kernel.
+
+ Next adjust your FILO command line to pick things up from the CF. My linux command
+ line in filo looks like:
+
+ AUTOBOOT_FILE = "hde:/vmlinuz initrd=hde:/initrd.gz root=/dev/hde console=tty0 ide4=noprobe"
+
+ The ide4=noprobe option is required to stop the kernel from probing the address used
+ by the CF. As this address is half that used as the standard address for a fifth (i.e. ide4)
+ controller, the kernel hangs whilst trying to initialise this device if this option
+ is not given.
+
+ Finally make sure that you have copied the necessary files onto your CF, and re-boot
+ your computer.
+
+
+
+******************* mkcfinitrd script **************************************
+#!/bin/sh
+#
+# Utility for constructing CF initrd for Epia-MII CF Boot
+#
+# Copyright (C) 2005 Nick Barker -- nick.barker9@btinternet.com
+#
+# Based on pcinitrd
+# Copyright (C) 1999 David A. Hinds -- dahinds@users.sourceforge.net
+
+SIZE=2400
+MODULES="pcmcia/pcmcia_core.o pcmcia/ds.o pcmcia/yenta_socket.o"
+BLK="kernel/drivers/ide/legacy/ide-cs.o"
+KERNEL=`uname -r`
+MODDIR=/lib/modules/$KERNEL
+BIN="bin/mount bin/umount sbin/insmod sbin/cardmgr"
+LIB=`ls /lib/libc.so.? | sort | tail -1`
+ETC="/etc/ld.so.cache /etc/pcmcia/config /etc/pcmcia/config.opts"
+DEV="/dev/console /dev/null /dev/ram /dev/tty1 /dev/tty2 /dev/tty3 /dev/tty4"
+MNT=/tmp/initrd.mnt
+
+# name of the initrd file to make
+TARGET=/tmp/initrd
+
+fail()
+{
+ umount $MNT
+ rmdir $MNT
+ exit 1
+}
+trap fail SIGTERM SIGINT
+
+strip_cp()
+{
+ if [ -d $3 ] ; then
+ DEST=$3/`basename $2`
+ else
+ DEST=$3
+ fi
+ strip $1 --verbose -o $DEST $2 | sed -e 's/([^ ]*)//g' || fail
+}
+
+mkdir --verbose $MNT || exit 1
+
+echo "Creating filesystem on $TARGET"
+if [ -b $TARGET ] ; then
+ rm $TARGET || fail
+fi
+
+dd if=$ROOT/dev/zero of=$TARGET bs=1k count=$SIZE
+echo "y" | mke2fs $TARGET $SIZE >/dev/null || fail
+mount --verbose -t ext2 -o loop $TARGET $MNT || fail
+
+
+rm -rf $MNT/lost+found
+echo "Creating Directories on $TARGET"
+for DIR in bin dev etc lib proc tmp mnt ; do
+ mkdir --verbose $MNT/$DIR || fail
+done
+for DIR in block misc fs net pcmcia ; do
+ mkdir --verbose $MNT/lib/$DIR || fail
+done
+
+echo "Copying Files to $TARGET"
+for F in $DEV ; do
+ cp -a --verbose /$F $MNT/dev || fail
+done
+if [ -e /dev/systty ] ; then
+ cp -a --verbose /dev/systty $MNT/dev || fail
+fi
+
+for F in $BIN ; do
+ strip_cp --strip-all /$F $MNT/bin
+done
+strip_cp --strip-all /bin/ash $MNT/bin/sh
+
+for F in $LIB ; do
+ strip_cp --strip-debug /$F $MNT/lib
+done
+cp --verbose /lib/ld-linux.so.? $MNT/lib || fail
+
+for F in $ETC ; do
+ cp --verbose /$F $MNT/etc || fail
+done
+for F in scsi network ftl ide memory serial ; do
+ touch $MNT/etc/$F ; chmod +x $MNT/etc/$F
+done
+
+for MOD in $MODULES ; do
+ strip_cp --strip-debug $MODDIR/$MOD $MNT/lib/$MOD
+done
+
+strip_cp --strip-debug $MODDIR/$BLK $MNT/lib/block/ide-cs.o
+
+echo "Creating linuxrc startup script"
+cat > $MNT/linuxrc <<- 'EOF'
+ #!/bin/sh
+
+ mount -t proc /proc /proc
+
+ echo ""
+ echo "==== initrd: starting PCMCIA services ===="
+ echo ""
+ PC=/lib/pcmcia
+ insmod $PC/pcmcia_core.o
+ insmod $PC/yenta_socket.o
+ insmod $PC/ds.o
+ insmod /lib/block/ide-cs.o
+ if [ "$DEBUG" != "" ] ; then V=-v ; fi
+ cardmgr $V -q -o -c /etc -m /lib -s /tmp/stab -p /tmp/pid
+ umount /proc
+ echo ""
+
+ if [ "$DEBUG" != "" ] ; then
+ /bin/sh < /dev/console
+ fi
+EOF
+chmod +x $MNT/linuxrc
+
+df -P $MNT | awk '/tmp/ { printf "%dK/%dK used\n",$3,$2 }'
+umount $VERBOSE $MNT
+rmdir $MNT
+echo "Finished $TARGET"
+echo "Now gzip $TARGET to create final initrd.gz"
+exit 0
+
+*************************** end mkcfinitrd *********************************** \ No newline at end of file