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| author | Wolfgang Denk <wd@denx.de> | 2010-01-17 23:55:53 +0100 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-03-21 22:22:44 +0100 |
| commit | c96f86eefc215b67dd222694ce2b6f60e6a42b0b (patch) | |
| tree | 9d076d61d88189965bd24eb0102c199e4c6d5b40 /README | |
| parent | 252b404d954f91499a4477a3e1064eb237ce5a1c (diff) | |
| download | u-boot-c96f86eefc215b67dd222694ce2b6f60e6a42b0b.zip u-boot-c96f86eefc215b67dd222694ce2b6f60e6a42b0b.tar.gz u-boot-c96f86eefc215b67dd222694ce2b6f60e6a42b0b.tar.bz2 | |
TFTP: allow for adjustable retransmission timout
So far, TFTP negotiated a fixed retransmission timeout of 5 seconds.
In some cases (busy networks, slow TFTP servers) this caused very
slow transfers. A new environment variable "tftptimeout" allows to
set this timeout. Lowering this value may make downloads succeed
faster in networks with high packet loss rates or with unreliable
TFTP servers.
Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Ben Warren <biggerbadderben@gmail.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 19 |
1 files changed, 16 insertions, 3 deletions
@@ -3005,7 +3005,9 @@ environment. As long as you don't save the environment you are working with an in-memory copy. In case the Flash area containing the environment is erased by accident, a default environment is provided. -Some configuration options can be set using Environment Variables: +Some configuration options can be set using Environment Variables. + +List of environment variables (most likely not complete): baudrate - see CONFIG_BAUDRATE @@ -3117,7 +3119,7 @@ Some configuration options can be set using Environment Variables: available network interfaces. It just stays at the currently selected interface. - netretry - When set to "no" each network operation will + netretry - When set to "no" each network operation will either succeed or fail without retrying. When set to "once" the network operation will fail when all the available network interfaces @@ -3133,7 +3135,18 @@ Some configuration options can be set using Environment Variables: tftpdstport - If this is set, the value is used for TFTP's UDP destination port instead of the Well Know Port 69. - vlan - When set to a value < 4095 the traffic over + tftpblocksize - Block size to use for TFTP transfers; if not set, + we use the TFTP server's default block size + + tftptimeout - Retransmission timeout for TFTP packets (in milli- + seconds, minimum value is 1000 = 1 second). Defines + when a packet is considered to be lost so it has to + be retransmitted. The default is 5000 = 5 seconds. + Lowering this value may make downloads succeed + faster in networks with high packet loss rates or + with unreliable TFTP servers. + + vlan - When set to a value < 4095 the traffic over Ethernet is encapsulated/received over 802.1q VLAN tagged frames. |