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Software for White Rabbit PTP Core
Commit bc16cefb authored by Alessandro Rubini's avatar Alessandro Rubini
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tools/sdbfs: files and config, so we can create sdbfs for wrpc 

The associated README explains how to use this stuff with w1 eeprom.
Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
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tools/sdbfs.README 0 → 100644
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SDB (Self Describing Bus) is designed withing the fpga-config-space OHWR
project. See http://www.ohwr.org/projects/fpga-config-space/wiki
The "sdbfs" implementation of SDB is a storage layout that lays out
data in a device using the same data structures we deviced for memory
spaces.
The tools/sdbfs directory includes the template to generate an sdbfs
to be written in the device's eeprom. It includes 4 files, which
have their "device-id" in SDB, using the first 4 characters of the name:
seen as devices from an sdn
file name sdb device name
-----------------------------------
mac-ddress mac-
wr-init wr-i
sfp-database sfp-
calibration cali
All the files are empty at this point, but ./tools/sdbfs/--SDB-CONFIG--
assigns a size to each of them. The code in wrpc-sw can read and write
the files.
All related tools (gensdbfs and so on) and their documentation live in
the fpga-config-space packages, sdbfs subdirectory.
To create the filesystem image: "gensdbfs tools/sdbfs /tmp/sdb-wrpc.bin"
(please note that empty files have no data to be stored, so no space is
wasted on disk for them and the output file is short).
To check: "sdb-read -l /tmp/sdb-wrpc.bin":
46696c6544617461:2e202020 @ 00000000-0000037f .
46696c6544617461:77722d69 @ 00000140-0000023f wr-init
46696c6544617461:6d61632d @ 00000240-00000245 mac-address
46696c6544617461:7366702d @ 00000280-000002ff sfp-database
46696c6544617461:63616c69 @ 00000300-0000037f calibration
This states where the various files are.
To write to w1-eeprom: "tools/wrpc-w1-write 0 320 < /tmp/sdb-wrpc.bin"
(this assumes that the size is 320 bytes.
The next boot of lm32 will show it found the files:
sdbfs: found at 0 in W1
file 0x2e202020 @ 0, name .
file 0x77722d69 @ 320, name wr-init
file 0x6d61632d @ 576, name mac-address
file 0x7366702d @ 640, name sfp-database
file 0x63616c69 @ 768, name calibration
tools/sdbfs/--SDB-CONFIG-- 0 → 100644
View file @ bc16cefb
#
# Even though in I2C eeproms we are going to be a subdirectory, not starting
# at offset zero at all, we want to start at zero *wihin* our space.
# This is actually the default, but stating it is better.
.
position = 0
# Then, we have a number of writable files. By default (i.e. no config)
# all existing files are created as read-only files with current contents
# and exact size.
#
# Allocation granularity is 64 bytes
mac-address
write = 1
maxsize = 6
wr-init
write = 1
maxsize = 256
# each sfp takes 29 bytes, 4 of them fit in 128 bytes
sfp-database
write = 1
maxsize = 128
# I don't know what this is
calibration
write = 1
maxsize = 128
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