U-Boot overlays (HERE BE EVIL DRAGONS, AND THEY BE HUNGRY) ;)

William_Hermans · December 28, 2016, 11:27pm

Anyway, this is pretty slick. How long do you figure it’ll take before this functionality come into the default uboot ?

RobertCNelson · December 29, 2016, 12:46am

Oh pretty quickly in the current version..

But i want to add the whole cape eeprom parser to u-boot..

That'll take more time..

Regards,

zmatt · July 24, 2017, 4:01pm

the cpsw/eth0 is just broken. i saw on github (irc zmatt) was looking at it

While I don’t exclude the possibility that the cpsw driver might be crappy (haven’t really looked at it much), the blame here actually lies with linux itself, which unconditionally resets the phy.

Latest version of the patch:

github.com

dutchanddutch/bb-kernel/blob/am33x-v4.9/patches/local/0003-WiP-trying-to-achieve-fast-link-up-at-boot.patch

From 3ebe8c85a490cdf3aaf12756adb03ddf8c58fe5b Mon Sep 17 00:00:00 2001
From: Matthijs van Duin <matthijsvanduin@gmail.com>
Date: Sat, 17 Dec 2016 03:51:43 +0100
Subject: [PATCH] WiP trying to achieve fast link up at boot

The phy already has been reset superfluously by u-boot and probably has
link up already.  Try to actually use that!
---
 drivers/net/ethernet/ti/davinci_mdio.c |  7 +++++++
 drivers/net/phy/phy.c                  |  2 +-
 drivers/net/phy/phy_device.c           |  1 +
 drivers/net/phy/smsc.c                 | 28 ++++++++++++++++++++++++++++
 4 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 425856f307e4..53f62c3480a3 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -281,6 +281,11 @@ static int davinci_mdio_read(struct mii_bus *bus, int phy_id, int phy_reg)
 		break;

This file has been truncated. show original

hmmm, I wonder if that works ?

If you had Cc’d me then you wouldn’t have needed to wonder

I’m not going to pretend it’s an elegant patch, but we’ve been using it for months now on all our beaglebones and it appears to work like a charm:

[ 5.548658] alexje kernel: net eth0: initializing cpsw version 1.12 (0)
[ 5.551254] alexje kernel: SMSC LAN8710/LAN8720 4a101000.mdio:00: attached PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=4a101000.mdio:00, irq=-1)
[ 5.551903] alexje kernel: cpsw 4a100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 5.593833] alexje systemd-networkd[105]: eth0: Gained carrier

Matthijs