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authorwdenk <wdenk>2003-08-17 18:55:18 +0000
committerwdenk <wdenk>2003-08-17 18:55:18 +0000
commite0ac62d798ce60ec5d43125d4786e58b0d881836 (patch)
tree3f32c8f29ff9089ef61099b11d81d51039bf2162 /doc
parentae3af05ec986a8ac66dadb5eafe13db2d4a02c5c (diff)
* Make Ethernet autonegotiation on INCA-IP work for all clock rates;U-Boot-0_4_6
allow selection of clock frequency as "make" target * Implement memory autosizing code for IceCube boards * Configure network port on INCA-IP for autonegotiation * Fix overflow problem in network timeout code * Patch by Richard Woodruff, 8 Aug 2003: Allow crc32 to be used at address 0x000 (crc32_no_comp, too).
Diffstat (limited to 'doc')
-rw-r--r--doc/README.INCA-IP14
1 files changed, 14 insertions, 0 deletions
diff --git a/doc/README.INCA-IP b/doc/README.INCA-IP
index 517eec04012..7421b6ed24d 100644
--- a/doc/README.INCA-IP
+++ b/doc/README.INCA-IP
@@ -41,4 +41,18 @@ to install a U-Boot image into flash.
go 0xb0000000
+
+Ethernet autonegotiation needs some time to complete. Instead of
+delaying the boot process in all cases, we just start the
+autonegotiation process when U-Boot comes up and that is all. Most
+likely, it will complete by the time the network transfer is
+attempted for the first time. In the worst case, if a transfer is
+attempted before the autonegotiation is complete, just a single
+packet would be lost resulting in a single timeout error, and then
+the transfer would proceed normally. So the time that we would have
+lost unconditionally waiting for the autonegotiation to complete, we
+have to wait only if the file transfer is started immediately after
+reset. We've verified that this works for all the clock
+configurations.
+
(C) 2003 Wolfgang Denk