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MIDAM MPC5200 DB1

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Revision as of 12:09, 22 October 2009 by Sojka (talk | contribs) (Revert to VxWorks boot with specified IP addres, it is necessary to specify serverip at least in enviroment.)

Description

Two sets of the MIDAM MPC5200 was delivered by the Mikroklima s.r.o. for our purposes. Each set consist of the:

  • Shark MPC52000 CPU module (pin compatible with TQ Components TQM5200 module),
  • MPC5200 v1.1 2008/02 carrier board.

Set #1 has s/n: 008770 and set #2 has s/n: 008771.

Board overview

Serial line (system console)

  • Loader system console is attached to the ttyPSC0 port.
  • The ttyPSC0 port is done in the LVTTL 3.3V logic, so appropriate 3.3V to RS-232 converter (e.g. MAX3232) is required for the serial console.

Communication parameters:

  • baud rate: 115200 bps
  • bits: 8 bit
  • stop bits: 1 bit
  • Parity: none
  • Flow control: none

Module memory map

The MPC5200B is 32 bit CPU, so it has a 32 bit address space. It is able to address up to 4 294 967 295 B (0xFFFFFFFF) - 4096 MB. The Shark module has been equipped with 128 MB DDR RAM and 64 MB NOR flash memory.

  • RAM chips: Samsung K4S511632D-UC(L)75, order: 32M x 16
  • Address space BASE address is 0x00000000
  • RAM is from 0x00000000 to 0x08000000 (128 MB)

Flash memory is being mapped at the and of address space (from 3.9375 GB).

  • Flash BASE address is 0xFC000000 (last address is 0xFFFFFFFF)
  • Flash memory size is 0x04000000 (64 MB)

There are three MTD partitions in the flash (defined in shark.dts). The flat device tree file syntax uses first address and length of the partition for its definition.

  • u-Boot (1 MB) from 0x00000000 to 0x00100000, length 0x00100000
  • kernel (3 MB) from 0x00100000 to 0x00400000, length 0x00300000
  • file-system (56 MB) from 0x00400000 to 0x04000000, length 0x03C00000

All these addresses are offsets against Flash BASE.

Boot loader

These boards are preinstalled with Das u-Boot boot loader. Behaviour of the u-Boot can be handled by its environment variables. Here are some useful commands:

  • printenv [variable] - prints complete environment or only given variable.
  • saveenv - commits whole environment in flash memory

For running linux kernel >2.6.25 it's necessary to upgrade u-Boot to newer version, which is able to hand over flat device tree to the kernel. Binary of u-Boot can be downloaded here: u-boot.bin.

U-Boot upgrade howto:

During the upgrade procedure it is necessary to proceed with utmost precaution, because there is no backup image of the u-Boot in the flash for recovery purposes. Fail-flash recovery isn't possible without JTAG interface. So, you have been warned. In future builds of the u-Boot there should be a support for recovery image. Follow this commands to upgrade U-Boot's image in flash memory: 

dhcp
tftp 800000 u-boot.bin
protect off fc000000 fc09ffff
erase fc000000 fc09ffff
cp.b 800000 fc000000 ${filesize}
protect on fc000000 fc09ffff

Now reboot and than commit new default environment: 

saveenv

How to access U-Boot environment variables from Linux ?

The U-Boot environment variables is possible to read and write trough utilities ... TO DO

Cross-tool chain

Necessary cross-tool chain for PowerPC platform can be build using Crossdev tool. You can install Crossdev on your Gentoo distro very simply: 

emerge -av crossdev

Some dependencies may go before. Building of tool chain itself will take some time, so let's go to take some coffee. 

crossdev --b 2.18-r3 --k 2.6.23-r3 --g 4.1.2 --without-headers -t powerpc-unknown-linux-gnu

For Debian, you can use a packages prepared by Pavel Píša.

Linux kernel

It is necessary to use patched Linux sources. We maintain them in our Git repository. You can clone it by: 

git clone git://rtime.felk.cvut.cz/shark/linux.git

Note: See Linux sources for the description of the repository and patch management techniques we use.

Now let's begin with the kernel configuration. First of all set target platform as Power PC and generate default config for MPC5200 platform.

  1. export ARCH=powerpc
  2. make 52xx/midam_defconfig (or use 52xx/ryu_defconfig for RYU board)
  3. make menuconfig

How to build the Flat Device Tree file

Since kernel version 2.6.25 is description of the platform hardware provided trough the Flat Device Tree. Necessary sources are now part of the kernel sources. Appropriate image could be build with this command: 

make ARCH=powerpc shark.dtb DTS_FLAGS="-S65536"

If DTS_FLAGS parameter omitted than following error will occur, because there is not enough space in the file, where the u-Boot can store some additional data about buses timing, etc.: 

WARNING: could not create /chosen FDT_ERR_NOSPACE.
ERROR: /chosen node create failed - must RESET the board to recover.

Root file system

New root file system has been built for MIDAM MPC5200 board. It's based on:

  • Vanilla linux kernel v2.6.26.5
  • Busybox v1.12.1
  • Dropbear v0.51
  • thttpd v2.25b


TO DO - UnionFS for root FS in flash

For long term usage is not really good to repeatedly overwrite block in the NOR flash chip, because memory cells are being punished. So it would be better to use jffs2 root FS only as RO file system and create RW tmpfs of same size. UnionFS than could be used to merge these two file systems and provide one RW file system. Changes in FS as a lock and log files can be made without permanent effect.

SocketCan

make KERNELDIR=/home/marsark/src/linux-2.6.26.5/_build/mpc5200_ryu/ CONFIG_CAN_MPC52XX=m CONFIG_CAN_MSCAN=m

CAN subsystem init script: 

modprobe can
modprobe mscan-mpc52xx
modprobe can-raw

echo 1000000 > /sys/class/net/can0/can_bittiming/bitrate
echo 1000000 > /sys/class/net/can1/can_bittiming/bitrate

ifconfig can0 up
ifconfig can1 up

Test the setup: 

cansend can0 123#4567

GPIO how set pin value

In MPC5200 have two kind of GPIO. The first one have wakeup capability, the second one is standard GPIO pins. Each of this sets have its own register sets, so some PSC ports are splitted in to two parts. See MOC5200B documentation section 7.3.2.1 and 7.3.2.2. The availability GPIO of PSC depends on GPS Port Configuration Register settings. For RYU boards is available all GPIO in PSC3 port (HW notation).

TODO: kernel still fails to initialise GPIO drivers on our boards !!! 

cat /sys/class/gpio/gpiochip248/label    //todo

Setting GPIO with wakeup capability

GPIO with wakeup using 

/sys/class/gpio/gpiochip248/

Pin notation: 

 0 -> GPIO_WKUP_7
 1 -> GPIO_WKUP_6
 2 -> PSC6_1
 3 -> PSC6_0
 4 -> ETH_17
 5 -> PSC3_9
 6 -> PSC2_4
 7 -> PSC1_4

Final value is 248 + requested pin (example for PSC2_4 248+6 => 254)

Enable PIN for GPIO: 

echo 254 >/sys/class/gpio/export

Set GPIO as output or input 

echo out >/sys/class/gpio/gpio254/direction
echo in >/sys/class/gpio/gpio254/direction

Set GPIO to 0 or 1 if configured as output pin 

echo 0 >/sys/class/gpio/gpio254/value
echo 1 >/sys/class/gpio/gpio254/value


Setting standard GPIO not tested

Standard GPIO using 

/sys/class/gpio/gpiochip216/

Pin notation: 

0..1  > reserved
2..3  > IRDA
4..7  > ETHR
8..11 > reserved
12..15 > USB
16..17 > reserved
18..23 > PSC3
24..27 > PSC2
28..31 > PSC1

Final value is 216 + requested pin (example for PSC3_3 216+20 => 236)

Enable PIN for GPIO: 

echo 236 >/sys/class/gpio/export

Set GPIO as output or input 

echo out >/sys/class/gpio/gpio236/direction
echo in >/sys/class/gpio/gpio236/direction

Set GPIO to 0 or 1 if configured as output pin 

echo 0 >/sys/class/gpio/gpio236/value
echo 1 >/sys/class/gpio/gpio236/value

RS485/RS422 selection on PSC1

In MPC5200 or schematic it is PSC2. In linux is PSC numbered from 0 so it is PSC1.

Pin configuration: 

echo 254 >/sys/class/gpio/export
echo out >/sys/class/gpio/gpio254/direction

Run for RS485: 

echo 1 >/sys/class/gpio/gpio254/value

Run for RS422: 

echo 0 >/sys/class/gpio/gpio254/value

Linux boot possibilities

PIN configuration

Bootloader is responsible for pin configuration. This is done by writing to GPS Port Configuration Register. The value written there is set by: 

set psc_cfg 91551044

GPS Port Configuration Register values for our boards:

  • original Midam board: 0x90552444
  • RYU_EDU_midam v1.B: 0x91551044

Kernel and root filesystem from flash

This is the default boot command. If you want to quickly switch several boot combinations, you can store these commands to a variable and use run command to boot linux from flash quickly. 

set bootcmd_linux 'set bootargs ${linux_console} ${bootargs_flash}; mw f0000b00 ${psc_cfg}; bootm fc120000 - fc100000'
set bootcmd 'run bootcmd_linux'

Kernel from flash and root filesystem over NFS

bootcmd_nfsroot=set bootargs ${linux_console} ${bootargs_nfs}; dhcp; mw f0000b00 ${psc_cfg}; bootm fc120000 - fc100000;
bootargs_nfs=root=/dev/nfs nfsroot=/midam rw ip=dhcp
run bootcmd_nfsroot

Kernel from TFTP and root filesystem over NFS

set serverip 147.32.86.30
set nfspath "/home/wsh/ppc/MPC5200/root-shark"
set imagefile ryu/uImage
set devicetreefile ryu/shark-ryu.dtb
set bootcmd_tftpnfs 'dhcp; tftp 800000 ${imagefile}; tftp 7f0000 ${devicetreefile}; set bootargs ${linux_console} root=/dev/nfs nfsroot=${serverip}:${nfspath} rw ip=dhcp; mw f0000b00 ${psc_cfg}; bootm 800000 - 7f0000'
run bootcmd_tftpnfs

Updating kernel image in flash memory

set serverip 10.1.1.3
set imagefile ryu/uImage
set devicetreefile ryu/shark-ryu.dtb
run update_kernel

It is supposed that update_kernel is set to the following value 

set update_kernel 'dhcp; tftp 800000 ${imagefile}; erase fc100000 fc3fffff; cp.b 800000 fc120000 ${filesize}; tftp 800000 ${devicetreefile}; cp.b 800000 fc100000 ${filesize};'

Updating root filesystem image in flash memory

From Linux with NFS root

Erase flash in U-Boot: 

erase fc400000 ffffffff

Boot Linux with NFS root and run: 

mount -t jffs2 /dev/mtdblock2 /mnt
cd /
cp -a `ls | grep -v '\(mnt\|proc\|sys\|tmp\)'` /mnt
cd /mnt; mkdir mnt proc sys tmp

From U-Boot

FIXME: This section needs some tuning. It works, but there are some problems.

Note: There seem to be no problems, if you use correct erase block size, when creating the FS image, i.e. use -e 0x20000 instead of -e 0x10000 (Martin Zidek)

Prepare filesystem image in a development machine and create the filesystem image: 

cd shark-root
mkfs.jffs2 -o ../shark-jffs2.img -b -e 0x10000
cp ../shark-jffs2.img /var/lib/tftpboot/ryu/

Then flash the image using the following uboot commands: 

set fs_image ryu/shark-jffs2.img
set update_filesystem 'dhcp; tftp 800000 ${fs_image}; erase fc400000 ffffffff; cp.b 800000 fc400000 ${filesize}'
run update_filesystem

Running RT kernel

cyclictest -p 80 -t5 -n
0.93 0.68 0.28 1/51 562

T: 0 (  544) P:80 I:1000 C: 354314 Min:     16 Act:   76 Avg:   69 Max:     190
T: 1 (  545) P:79 I:1500 C: 236209 Min:     17 Act:   35 Avg:   53 Max:     131
T: 2 (  546) P:78 I:2000 C: 177157 Min:     21 Act:   46 Avg:   56 Max:     123
T: 3 (  547) P:77 I:2500 C: 141726 Min:     21 Act:   41 Avg:   53 Max:     155
T: 4 (  548) P:76 I:3000 C: 118105 Min:     23 Act:   30 Avg:   56 Max:     126


Booting VxWorks

set ethaddr 00:04:9f:00:27:xx
set psc_cfg 91551044
set bootcmd_vxworks 'set serverip 147.32.87.33; dhcp; mw f0000b00 ${psc_cfg}; tftp 0x100000 vxworks/vxWorks-midam.bin; go 0x100000'
set bootcmd 'run bootcmd_vxworks'
saveenv

Older tests: 

dhcp; set serverip 147.32.86.187; set bootfile vxWorks.bin; tftp 0x00100000; go 0x00100000

Compiling VxWorks

It is assumed that VxWorks in installed under /opt/WindRiver 

/opt/WindRiver/wrenv.sh -p vxworks-6.6
cd <bsp_project>
make
... TODO ...
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