TS-75XX Errata ethhang

From embeddedTS Manuals
Revision as of 16:17, 6 February 2012 by Kris (talk | contribs) (Created page with "{| class="wikitable" |- | Synopsis | 160ms Delay with ETH0 Disconnected |- | Severity | Minor |- | Class | Kernel Bug |- | Affected | All TS-75XX/TS-4500 Boards |- | Status | ...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Synopsis 160ms Delay with ETH0 Disconnected
Severity Minor
Class Kernel Bug
Affected All TS-75XX/TS-4500 Boards
Status Workarounds available

Description:

The Cavium STR8100 NIC driver was programmed with 160ms delays when Ethernet is physically disconnected (see function static void internal_phy_patch_check(int init) of .../drivers/net/str8100/star_nic.c). This causes delayed responses in real-time applications such as canctl. When Ethernet is physically connected, the issue is nonexistent.

Workaround:

TS-75XX/TS-4500 users wanting to utilize real-time responses without Ethernet plugged in will need to:

1. Bring the eth0 interface down with the command: 

     ifconfig eth0 down

2. Recompile the kernel without the Ethernet driver from Cavium (.../drivers/net/str8100/star_nic.c)

Retrieved from "http://docs.embeddedTS.com/index.php?title=TS-75XX_Errata_ethhang&oldid=1338"