How to stop / (re)start a MAC?

[tmoos]

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

[LFGP]

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

[tmoos]

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.

[LFGP]

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.

[tmoos]

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 Can I switch SerDes protocol at runtime? 

[LFGP]

 Two NXP employees have said it is NOT possible.

Please review the post