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@a0000000: 0 (eMMC)
=> mmc info
Device: sdio-host@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,
