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The userspace utility spiflashctl is the software layer that presents an NBD device to the NOR flash.


spiflashctl would usually be called with something similar to this:

spiflashctl --lun 1 --nbdserver lun0:disc,lun0:part1,lun0:part2,lun0:part3

--lun 1

This specifies which chip select you want to use. Typically we will use chip select 1 for offboard flash, and 0 for onboard flash.

--nbdserver lun0:disc,lun0:part1,lun0:part2,lun0:part3

This sets up an nbd server with the various partitions and raw block devices.

lun0:disc will create the raw block device at port 7525.

lun0:part1 will create the first partition at port 7526.

lun0:part2 will create the first partition at port 7527.

Connecting a client

You can set up any number of partitions you need this way. The network block device ports are accessed using the standard nbd-client. Typically they will be invoked like this:

  nbd-client 7525 /dev/nbd0
  nbd-client 7526 /dev/nbd1
  nbd-client 7527 /dev/nbd2
  nbd-client 7528 /dev/nbd3
  nbd-client 7529 /dev/nbd4

This way /dev/nbd0 will be the block device, /dev/nbd1 will be the first partition, and so on.


Usage: spiflashctl [OPTION] ...                                                                                                                                                                                                                                                
Technologic Systems SPI flash manipulation.                                                                                                                                                                                                                                    
General options:                                                                                                                                                                                                                                                               
  -R, --read=N            Read N blocks of flash to stdout                                                                                                                                                                                                                     
  -W, --write=N           Write N blocks to flash                                                                                                                                                                                                                              
  -x, --writeset=BYTE     Write BYTE as value (default 0)                                                                                                                                                                                                                      
  -i, --writeimg=FILE     Use FILE as file to write to flash                                                                                                                                                                                                                   
  -t, --writetest         Run write speed test                                                                                                                                                                                                                                 
  -r, --readtest          Run read speed test                                                                                                                                                                                                                                  
  -n, --random=SEED       Do random seeks for tests                                                                                                                                                                                                                            
  -z, --blocksize=SZ      Use SZ bytes each sdread/sdwrite call                                                                                                                                                                                                                
  -k, --seek=SECTOR       Seek to 512b sector number SECTOR                                                                                                                                                                                                                    
  -V, --verify            Verify reads and writes                                                                                                                                                                                                                              
  -e, --erase             Erase entire device                                                                                                                                                                                                                                  
  -d, --nbdserver=NBDSPEC Run NBD userspace block driver server                                                                                                                                                                                                                
  -Q, --stats             Print NBD server stats                                                                                                                                                                                                                               
  -I, --bind=IPADDR       Bind NBD server to IPADDR                                                                                                                                                                                                                            
  -l, --lun=N             Use chip number N                                                                                                                                                                                                                                    
  -P, --printmbr          Print MBR and partition table                                                                                                                                                                                                                        
  -M, --setmbr            Write MBR from environment variables                                                                                                                                                                                                                 
  -h, --help              This help                                                                                                                                                                                                                                            
When running a NBD server, NBDSPEC is a comma separated list of                                                                                                                                                                                                                
devices and partitions for the NBD servers starting at port 7525.                                                                                                                                                                                                              
e.g. "lun0:part1,lun1:disc" corresponds to 2 NBD servers, one at port                                                                                                                                                                                                          
7525 serving the first partition of chip #0, and the other at TCP                                                                                                                                                                                                              
port 7526 serving the whole disc device of chip #1.