Hi Mahesh,
On Mon, 20 Dec 2021 at 05:55, mahesh mv maheshm_v@yahoo.com wrote:
Hi all, We have a board where we plan to connect 2 USB devices of MASS storage class. One of the devices (3) is plugged in all the timebut the other USB is hotplugged when ever its required. The issue we are facing is the device number is not deterministic acrossreboots with uboot 2021 . Is there a way to fix the Device 3 below as the first one all the time in DTS file or some other mechanism in uboot. Emerald:> versionU-Boot 2021.07--11625-ge998855ac2-dirty (Dec 07 2021 - 23:22:27 +0530) aarch64-broadcom-linux-gnu-gcc.br_real (Buildroot 2019.08) 8.3.0GNU ld (GNU Binutils) 2.31.1
Emerald:> usb info 1: Hub, USB Revision 3.0 - U-Boot XHCI Host Controller - Class: Hub - PacketSize: 512 Configurations: 1 - Vendor: 0x0000 Product 0x0000 Version 1.0 Configuration: 1 - Interfaces: 1 Self Powered 0mA Interface: 0 - Alternate Setting 0, Endpoints: 1 - Class Hub - Endpoint 1 In Interrupt MaxPacket 8 Interval 255ms 2: Hub, USB Revision 2.0 - USB2.0 Hub - Class: Hub - PacketSize: 64 Configurations: 1 - Vendor: 0x05e3 Product 0x0608 Version 96.112 Configuration: 1 - Interfaces: 1 Self Powered Remote Wakeup 100mA Interface: 0 - Alternate Setting 0, Endpoints: 1 - Class Hub - Endpoint 1 In Interrupt MaxPacket 1 Interval 12ms 3: Mass Storage, USB Revision 2.10 - SanDisk Ultra 040122c9e4a887e576fc7d3a05f5898 - Class: (from Interface) Mass Storage - PacketSize: 64 Configurations: 1 - Vendor: 0x0781 Product 0x5581 Version 1.0 Configuration: 1 - Interfaces: 1 Bus Powered 224mA Interface: 0 - Alternate Setting 0, Endpoints: 2 - Class Mass Storage, Transp. SCSI, Bulk only - Endpoint 1 In Bulk MaxPacket 512 - Endpoint 2 Out Bulk MaxPacket 512 4: Mass Storage, USB Revision 2.0 - Virtium VTDU31XC008G-A901 P1T65005607903260051 - Class: (from Interface) Mass Storage - PacketSize: 64 Configurations: 1 - Vendor: 0x2aaa Product 0x0100 Version 1.0 Configuration: 1 - Interfaces: 1 Bus Powered 100mA Interface: 0 - Alternate Setting 0, Endpoints: 2 - Class Mass Storage, Transp. SCSI, Bulk only - Endpoint 1 In Bulk MaxPacket 512 - Endpoint 1 Out Bulk MaxPacket 512
The output is a bit garbled.
You can add USB devices to the devicetree if you like. See usb_scan_device() which calls usb_find_child() to find such a device.
Regards, Simon
Thanks,Mahesh