USB mass storage gadget on SAMA5D2

[Eugen Hristev]

Hi,

I believe someone from Microchip have tried this before
Some people in CC added

You can also open a case on support.microchip.com

Eugen

On 5/19/23 23:18, admin LI wrote:
> Hi,
> 
> I'm trying to use ums to access EMMC on our SAMA5D2 board without success.
> 
> My board_init(), without adding usba_udc_probe() ums will cause data abort
> error:
> int board_init(void)
> {
> /* address of boot parameters */
> gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
> 
> #ifdef CONFIG_USB_GADGET_ATMEL_USBA
> at91_udp_hw_init();
> usba_udc_probe(&pdata);
> #endif
> 
> return 0;
> }
> 
> USB related config:
> CONFIG_USB=y
> CONFIG_USB_EHCI_HCD=y
> CONFIG_USB_STORAGE=y
> CONFIG_USB_GADGET=y
> CONFIG_USB_GADGET_VENDOR_NUM=0xdead
> CONFIG_USB_GADGET_PRODUCT_NUM=0xbeef
> CONFIG_USB_GADGET_ATMEL_USBA=y
> CONFIG_USB_GADGET_VBUS_DRAW=500
> CONFIG_USB_GADGET_DOWNLOAD=y
> CONFIG_USB_ETHER=y
> 
> EMMC can be successfully accessed, Linux boot is ok:
> => mmc list
> sdio-host at a0000000: 0 (eMMC)
> 
> => mmc info
> Device: sdio-host at a0000000
> Manufacturer ID: 70
> OEM: 100
> Name: M6270
> Bus Speed: 52000000
> Mode: MMC High Speed (52MHz)
> Rd Block Len: 512
> MMC version 5.1
> High Capacity: Yes
> Capacity: 3.6 GiB
> Bus Width: 4-bit
> Erase Group Size: 512 KiB
> HC WP Group Size: 4 MiB
> User Capacity: 3.6 GiB
> Boot Capacity: 2 MiB ENH
> RPMB Capacity: 512 KiB ENH
> Boot area 0 is not write protected
> Boot area 1 is not write protected
> 
> => mmc part
> 
> Partition Map for MMC device 0  --   Partition Type: DOS
> 
> Part    Start Sector    Num Sectors     UUID            Type
>    1     2048            1044480         0508e2bf-01     83
> 
> However, when I use "ums 0 mmc 0", the USB device is partially enumerated
> without a block device available, in the console the rotation cursor spins
> about 20s then USB is disconnected.
> 
> On u-boot:
> => ums 0 mmc 0
> UMS: LUN 0, dev mmc 0, hwpart 0, sector 0x0, count 0x720000
> -=> (self-exit after 20s)
> 
> On Linux:
> [  699.920316] usb 3-5: new high-speed USB device number 5 using xhci_hcd
> [  700.060766] usb 3-5: New USB device found, idVendor=dead,
> idProduct=beef, bcdDevice= 2.17
> [  700.060772] usb 3-5: New USB device strings: Mfr=1, Product=2,
> SerialNumber=0
> [  700.060774] usb 3-5: Product: USB download gadget
> [  700.060776] usb 3-5: Manufacturer: U-Boot
> [  700.081573] usb-storage 3-5:1.0: USB Mass Storage device detected
> [  700.081780] scsi host0: usb-storage 3-5:1.0
> [  700.081874] usbcore: registered new interface driver usb-storage
> [  700.088339] usbcore: registered new interface driver uas
> [  722.407008] usb 3-5: USB disconnect, device number 5
> 
> 
> Thanks,