topic Re: How to stop / (re)start a MAC? in Layerscape

How to stop / (re)start a MAC?

tmoos — Tue, 25 Apr 2023 08:50:27 GMT

I wrote code to reconfigure the SerDes lane used by MAC9 (I'm switching from XFI to SGMII), but I can't send or receive network packets. Is suspect that MAC9 is not running properly after reconfiguration.

Questions:

How can I properly disable the MAC?
- In particular: How to "Disable FM_BMI proper port etc" as stated in LS1046A DPAA Manual)?
How can I properly enable the MAC again?

Additional information:

Before reconfiguring SerDes I stop the MAC as follows:

COMMAND_CONFIG[RXSTP] = 1 Wait until IEVENT[RX_EMPTY] == 1 COMMAND_CONFIG[RX_EN] = 0 Wait until IEVENT[TX_EMPTY] == 1 COMMAND_CONFIG[TX_EN] = 0

After reconfiguration I start the MAC as follows:

COMMAND_CONFIG[SWR] = 1, COMMAND_CONFIG[RXSTP] = 1 IF_MODE = 0x9002 STATN_CONFIG[CLR] = 1 Wait 1 µs IEVENT = 0x0 IMASK = 0x0 COMMAND_CONFIG[RX_EN] = 1, COMMAND_CONFIG[TX_EN] = 1

Re: How to stop / (re)start a MAC?

LFGP — Mon, 01 May 2023 18:08:53 GMT

Hello tmoos,

please develop the next command, I need to have an idea what is missing in your configuration, please let me know the command output

$ ifconfig

Re: How to stop / (re)start a MAC?

tmoos — Tue, 02 May 2023 13:06:43 GMT

I'm currently working with U-Boot, not with Linux. U-Boot has no "ifconfig" command.

But my primary question is currently: Is it even possible to switch the SerDes protocol at runtime? I asked this here:

https://community.nxp.com/t5/Layerscape/Can-I-switch-SerDes-protocol-at-runtime/m-p/1640345#M12340

I would be grateful if that question could be answered before I continue with other implementation details.

Re: How to stop / (re)start a MAC?

LFGP — Wed, 03 May 2023 15:54:35 GMT

to reconfigure the SerDes lane protocol at strict runtime it is not possible, because that configuration must be write in the RCW and you can't rewrite the RCW at runtime.

Re: How to stop / (re)start a MAC?

tmoos — Tue, 16 May 2023 10:22:33 GMT

I got different reaction to my questions. A NXP employee said it is possible, but other NXP employees said it is not.

Howsoever, the question is discussed in another topic, see

Re: How to stop / (re)start a MAC?

LFGP — Wed, 17 May 2023 14:59:03 GMT

Two NXP employees have said it is NOT possible.

Please review the post