Hello Philippe,
Am Samstag, den 27.12.2014, 15:39 +0100 schrieb ledphilippe@xxxxxxxxx:
> Hello,
>
> The current version (2014.12.0-00116-ge91702b) crashes on the beaglebone black
> if the ethernet driver is enabled. Here is the trace:
>
> barebox 2014.12.0-00116-ge91702b #15 Sat Dec 27 15:30:25 CET 2014
>
>
> Board: TI AM335x BeagleBone black
> detected 'BeagleBone Black'
> cpsw 4a100000.ethernet: detected phy mask 0x1
> mdio_bus: miibus0: probed
> eth0: got preset MAC address: d0:39:72:41:0a:26
> cpsw 4a100000.ethernet: probe failed: I/O error
> unable to handle paging request at address 0x6e6f62f2
> pc : [<9fe24e4a>] lr : [<9fe0751f>]
> sp : 9ffffe60 ip : ffffffff fp : 00000000
> r10: 8ff1d8b8 r9 : 8ff12534 r8 : 8ff1d974
> r7 : ffffffff r6 : 8ff1d8e0 r5 : 9fe55220 r4 : 6e6f62f2
> r3 : 00000000 r2 : 00000000 r1 : 8ff1d8e0 r0 : 6e6f62f2
> Flags: nZCV IRQs off FIQs on Mode SVC_32
> [<9fe24e4a>] (strcmp+0xc/0x1a) from [<9fe0751f>]
> (get_device_by_name_id+0x1f/0x38)
> [<9fe0751f>] (get_device_by_name_id+0x1f/0x38) from [<9fe07837>]
> (register_device+0x17/0xc8)
> [<9fe07837>] (register_device+0x17/0xc8) from [<9fe1dcb3>]
> (of_platform_device_create+0x17b/0x1b0)
> [<9fe1dcb3>] (of_platform_device_create+0x17b/0x1b0) from [<9fe1dd13>]
> (of_platform_bus_create+0x2b/0x68)
> [<9fe1dd13>] (of_platform_bus_create+0x2b/0x68) from [<9fe1dda7>]
> (of_platform_populate+0x2f/0x44)
> [<9fe1dda7>] (of_platform_populate+0x2f/0x44) from [<9fe07967>]
> (platform_probe+0x9/0xa)
> [<9fe07967>] (platform_probe+0x9/0xa) from [<9fe07561>]
> (device_probe+0x11/0x44)
> [<9fe07561>] (device_probe+0x11/0x44) from [<9fe075bb>]
> (match.part.2+0x27/0x2e)
> [<9fe075bb>] (match.part.2+0x27/0x2e) from [<9fe076d5>]
> (register_driver+0x59/0x74)
> [<9fe076d5>] (register_driver+0x59/0x74) from [<9fe00827>]
> (start_barebox+0x1b/0xb8)
> [<9fe00827>] (start_barebox+0x1b/0xb8) from [<9fe3291f>] (__start+0xa3/0xb8)
> [<9fe3291f>] (__start+0xa3/0xb8) from [<9fe00005>] (__bare_init_start+0x1/0xc)
>
> [<9fe32349>] (unwind_backtrace+0x1/0x58) from [<9fe258e9>] (panic+0x1d/0x34)
> [<9fe258e9>] (panic+0x1d/0x34) from [<9fe327e1>] (do_exception+0xd/0x10)
> [<9fe327e1>] (do_exception+0xd/0x10) from [<9fe32849>]
> (do_data_abort+0x21/0x2c)
> [<9fe32849>] (do_data_abort+0x21/0x2c) from [<9fe32508>]
> (data_abort+0x48/0x60)
>
>
I suspect the issue comes from the dummy cpsw_emac1 node which adds a
non existing phy in the beaglebone device tree. So the mdiobus_scan
fails. This patch will workaround the issue but I'm unsure about right
solution here.
Regards,
Teresa
>
> The following patch resolves the problem on my board. Please review it and
> check if it is fine.
>
> Regards,
>
>
> Signed-off-by: Philippe Leduc <ledphilippe@xxxxxxxxx>
> ---
> drivers/net/cpsw.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/cpsw.c b/drivers/net/cpsw.c
> index b6618ad..311cd44 100644
> --- a/drivers/net/cpsw.c
> +++ b/drivers/net/cpsw.c
> @@ -1202,10 +1202,8 @@ int cpsw_probe(struct device_d *dev)
> struct phy_device *phy;
>
> phy = mdiobus_scan(&priv->miibus, priv->slaves[i].phy_id);
> - if (IS_ERR(phy)) {
> - ret = PTR_ERR(phy);
> - goto out;
> - }
> + if (IS_ERR(phy))
> + continue;
>
> phy->dev.device_node = priv->slaves[i].dev.device_node;
> ret = phy_register_device(phy);
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