Hi Florian,
Hi Jochen,
On 11/21/2017 12:10 AM, Jochen Friedrich wrote:
Hi Florian,
i just tested the latest DSA patches for b53 on a bpi-r1 device (net:
dsa: b53: Turn on Broadcom tags).
Unfortunately, the bcm53125 does not seem to handle the broadcom tags on
CPU port although tuned on b53_brcm_hdr_setup(). The tag is still
visible on a device connected to one of the switch ports.
I wonder if there is something else necessary to make the chip handle
the tags or if the chip doesn't support broadcom tags after all. The
documentation at
https://sourceforge.net/p/ohvesw/svn/12/tree/document/bcm/53125U-DS02-R.pdf
doesn't document register 3 in the management page, at all...
I am afraid U stands for unmanaged, which means we may not have any
possibility to enable Broadcom tags on that particular model. And you
are right, I also don't see any Broadcom HDR control register in the
datasheet, only the 53125M and S seem to have that, darn.
I had a closer look at the board, and it really has the 53125S
soldered. The U datasheet seems to be the only one publically
available though.
Does the following patch help at all (I don't really expect it to)?
The patch doesn't make a difference, unfortunately.
Could you also provide me with two piieces of information that could
help detect such a switch model:
- what is the value of the revision register (should be printed along
with BCM53125 during boot)?
b53_common: found switch: BCM53125, rev 4
- what is the value of page 02, register 3 during b53_switch_detect()? A
managed switch should have this set to 0x3, whereas I would expect an
unmanaged switch to be 0x0
I'll check this and tell you.
Thanks, Jochen
