Once the interface settings are configured files may be
retrieved from the network using the TFTP protocol. Files are
accessed with the (tftpboot) source. If no
filename is given the one provided by
the DHCP server will be used, if the DHCP server doesn't
provide a filename one based upon the hardware unique ID is used
(the
hwinfo command can
be used to find the unique ID).
Most of the operations described here are not usually required if a properly configured DHCP and TFTP servers are used. Any file that can be accessed using TFTP can be used wherever a filename is used within ABLE, no distinction between network and local files is explicitly made (the one exception being that filesystem stat calls cannot be sensibly answered via TFTP).
The ability to use the network in this way allows for a very rapid compile, execute and test cycle. No physical media is involved and mistakes can be rectified and retested in a short time.
Example 8.1. Executing a program using the tftpboot pseudo filesystem
This example shows the batty board test tool being retrieved over the network using a default DHCP configuration.
>(tftpboot)batty tftp: attempting bootp bootp: sending request bootp: serverip: 192.168.7.1 bootp: netmask: 255.255.255.0 bootp: serverip: 192.168.7.1 bootp: netmask: 255.255.255.0 bootp: address: 192.168.7.222 .....loaded (tftpboot)batty, 0x8040 bytes at 0x00008000 boot: booting 'able app1' Simtec Board Test Tool, Version 0.10 (c) 2005 Simtec Electronics EB2410ITX (BAST) Test Suite Testing S3C24XX CPU Core CPU ID 32410002, OK [S3C2410A] Testing internal SRAM block Pattern: all ones Pattern: all zeros Pattern: alternate zero/ones (LSB set) Pattern: alternate zero/ones (LSB unset) Writing address to each location Testing system RAM [0x00400000..0x07d00000] Pattern: all ones Pattern: all zeros Pattern: alternate zero/ones (LSB set) Pattern: alternate zero/ones (LSB unset) Writing address to each location Checking ABLE CRC CRC OK Searching for ABLE info Version 208 Release 2005041001 Supported machine number 3 Supported machine number 6 Testing CPLD registers CPLD ID register (value 00) OK DONE: 13 tests, 13 ok, 0 failed, 0 warnings PASSED: all tests OK >