Linux/AM5718: DFU on AM571x

Simit Ghane

Part Number: AM5718

Tool/software: Linux

Hello All,

We are using AM5718 based custom board and we are updating firmware using DFU.

Right now we know that the DFU will not support super spped (USB 3.0) . But still when we are connecting our device to the USB3.0 host we are getting some logs which is indicating that the device is responding over USB3.0 and then get failed.

is there any way in which we stopped to detect the super speed mode and it will detect in high speed if board is already connecting in USB3.0 Host Port.

This are the log's of it from Host which i need to remove.

[18654.120029] usb 4-1: new SuperSpeed USB device number 9 using xhci_hcd
[18654.136430] usb 4-1: LPM exit latency is zeroed, disabling LPM.
[18654.136995] usb 4-1: New USB device found, idVendor=0451, idProduct=d014
[18654.137004] usb 4-1: New USB device strings: Mfr=33, Product=37, SerialNumber=0
[18654.137011] usb 4-1: Product: VAYU
[18654.137018] usb 4-1: Manufacturer: Texas Instruments
[18657.872214] xhci_hcd 0000:00:14.0: Cannot set link state.
[18657.872231] usb usb4-port1: cannot disable (err = -32)
[18657.872240] usb 4-1: USB disconnect, device number 9

Thanks ,

Simit

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Please post what Linux version you are using.

0 Simit Ghane over 6 years ago in reply to Biser Gatchev-XID

Intellectual 980 points

I am using linux 4.15.0-47-generic.

0 Bin Liu over 6 years ago

TI__Guru**** 168261 points

Hi Simit,

Simit Ghane said:
is there any way in which we stopped to detect the super speed mode and it will detect in high speed if board is already connecting in USB3.0 Host Port.

If the usb port is designed to have super-speed, the only way I can think of to use only use high-speed connection for DFU is to use a usb2.0 cable or add a usb2.0 hub in the middle.

0 Simit Ghane over 6 years ago in reply to Bin Liu

Intellectual 980 points

Hi,

shall we change spl or DFU source code which does not detect the superspeed. It always detect high speed mode if already superspeed connection is available?

Thanks,

Simit

0 Bin Liu over 6 years ago in reply to Simit Ghane

TI__Guru**** 168261 points

Hi,

First of all, software cannot disable super-speed if those super-speed TX/RX pins are connected, so super-speed cannot be disabled in SPL. Most importantly, the very first DFU stage is in ROM, which cannot be changed at all to disable super-speed if software solution did exist.

So using a usb2.0 cable or hub is the only option I can think of.

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Linux/AM5718: DFU on AM571x