18
GR-LEON4-ITX Development Board
Quick Start Guide
to the SPI boot PROM on the GR-LEON4-ITX board. The first step in communicating with
the SPI memory device is to allow the SPI Flash layer to detect the device:
grlib> spim flash detect
Got manufacturer ID 0x20 and Device ID 0x2017
No device match for READ ID instruction, trying RES instruction..
Found matching device: ST/Numonyx M25P64
grlib>
Since the SPIMCTRL core maps the memory device into AMBA address space we can read
the memory device using GRMON's
mem
command:
grlib> mem 0
0 ffffffff ffffffff ffffffff ffffffff ................
10 ffffffff ffffffff ffffffff ffffffff ................
20 ffffffff ffffffff ffffffff ffffffff ................
30 ffffffff ffffffff ffffffff ffffffff ................
grlib>
In the read out above the device is empty. We can now try to load a file to the device. First
we give a shell command that lists the contents of the small S-REC file we will use for this
example (do not issue the
shell cat
command on large or non-text files)
grlib> shell cat ~/tests/test_seq4-small
S0030000FC
S315000000000000000004040404080808080C0C0C0C4A
S315000000101010101014141414181818181C1C1C1C3A
S315000000202020202024242424282828282C2C2C2C2A
S315000000303030303034343434383838383C3C3C3C1A
S315000000404040404044444444484848484C4C4C4C0A
S315000000505050505054545454585858585C5C5C5CFA
S315000000606060606064646464686868686C6C6C6CEA
S315000000707070707074747474787878787C7C7C7CDA
… and so on. We can now download this file to the memory device:
grlib> spim flash load ~/tests/test_seq4-small
section: at 0x0, size 256 bytes
entry point: 0x0
After downloading the file we can see that the contents has been written to the flash device:
grlib> mem 0
0 00000000 04040404 08080808 0c0c0c0c ................
10 10101010 14141414 18181818 1c1c1c1c ................
20 20202020 24242424 28282828 2c2c2c2c $$$$((((,,,,
30 30303030 34343434 38383838 3c3c3c3c 000044448888<<<<
grlib>
GRMON also has support for dumping the contents of the memory device into a S-REC file,
see the
GRMON User's Manual
for details.
Finally, we can erase the device, this should always be done before attempting to load data
into the memory. Erasing is quite slow and will take a little over sixty seconds:
grlib> spim flash erase
grlib> mem 0 4
0 ffffffff ffffffff ffffffff ffffffff ................
grlib>
When the device is erased, all bits will be set to '1'.
© Aeroflex Gaisler AB
June 2010, Rev. 0.2
