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54 lines
2.0 KiB
Plaintext
54 lines
2.0 KiB
Plaintext
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SDB (Self Describing Bus) is designed withing the fpga-config-space OHWR
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project. See http://www.ohwr.org/projects/fpga-config-space/wiki
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The "sdbfs" implementation of SDB is a storage layout that lays out
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data in a device using the same data structures we deviced for memory
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spaces.
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The tools/sdbfs directory includes the template to generate an sdbfs
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to be written in the device's eeprom. It includes 4 files, which
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have their "device-id" in SDB, using the first 4 characters of the name:
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seen as devices from an sdn
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file name sdb device name
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-----------------------------------
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mac-ddress mac-
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wr-init wr-i
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sfp-database sfp-
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calibration cali
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All the files are empty at this point, but ./tools/sdbfs/--SDB-CONFIG--
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assigns a size to each of them. The code in wrpc-sw can read and write
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the files.
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All related tools (gensdbfs and so on) and their documentation live in
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the fpga-config-space packages, sdbfs subdirectory.
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To create the filesystem image: "gensdbfs tools/sdbfs /tmp/sdb-wrpc.bin"
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(please note that empty files have no data to be stored, so no space is
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wasted on disk for them and the output file is short).
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To check: "sdb-read -l /tmp/sdb-wrpc.bin":
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46696c6544617461:2e202020 @ 00000000-0000037f .
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46696c6544617461:77722d69 @ 00000140-0000023f wr-init
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46696c6544617461:6d61632d @ 00000240-00000245 mac-address
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46696c6544617461:7366702d @ 00000280-000002ff sfp-database
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46696c6544617461:63616c69 @ 00000300-0000037f calibration
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This states where the various files are.
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To write to w1-eeprom: "tools/wrpc-w1-write 0 320 < /tmp/sdb-wrpc.bin"
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(this assumes that the size is 320 bytes.
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The next boot of lm32 will show it found the files:
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sdbfs: found at 0 in W1
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file 0x2e202020 @ 0, name .
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file 0x77722d69 @ 320, name wr-init
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file 0x6d61632d @ 576, name mac-address
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file 0x7366702d @ 640, name sfp-database
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file 0x63616c69 @ 768, name calibration
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