memutil

Description

This driver reads and writes memory on the linux machine.

Build

make

Using Specific kernel source or Cross Compile

cp sample.config .config
vim .config
# edit .config file
make

Usage

Read

echo "read|r length addr [read_cycle]" > /dev/memd

• length: read size[byte]
• addr: read top address(hex)
• read_cycle(option): read cycle[byte] (default is 4)
  • list: [ 1, 2, 4];

example

echo "read 8 0x12345678 4" > /dev/memd
# [0x12345678] 0x78563412
echo "read 10 0x12345678 2" > /dev/memd
# [0x12345678] 0x3412
echo "read 8 0x12345678 1" > /dev/memd
# [0x12345678] 0x12

Write

echo "write|r length addr value" > /dev/memd

• length: write size[byte]
  • list[1, 2, 4]
• addr: write top address(hex)
• value: write data(hex)

example

# [0x12345678] 0x7856eeee
echo "write 4 0x12345678 0xAAAAAAAA" > /dev/memd
# [0x12345678] 0xAAAAAAAA

Monitor

echo "monitor|m length addr read_cycle" > /dev/memd
cat /dev/memd

• length: read size[byte]
  • Max: 1024
• addr: read top address(hex)
• read_cycle(option): read cycle[byte] (default is 4)
  • list: [ 1, 2, 4];

example

echo "monitor|m length addr value" > /dev/memd
cat /dev/memd
# when value is changed, value is shown

Polling

echo "polling|p length addr read_cycle interval" > /dev/memd
cat /dev/memd

• length: read size[byte]
  • Max: 1024
• addr: read top address(hex)
• read_cycle(option): read cycle[byte] (default is 4)
  • list: [ 1, 2, 4];
• interval: interval time[msec]

example

echo "polling 32 0x12345678 1 1000" > /dev/memd
cat /dev/memd
#                0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f
#[0x12345678] 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
#[0x12345688] 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
.
.
.

wrapper script

• memutil.sh

Usage

• See ./memutil.sh -h

bug?

iowrite8 and iowrite16 is strange...

# before: [0x12345678] 0x78563412
echo "write 1 0x12345678 0xFF" > /dev/memd
# result:   [0x12345678] 0xFFFFFFFF
# expected: [0x12345678] 0x785634FF

# [0x12345678] 0x785634ff
echo "write 2 0x12345678 0xDDEE" > /dev/memd
# result:   [0x12345678] 0xDDEEDDEE
# expected: [0x12345678] 0x7856DDEE