From mboxrd@z Thu Jan 1 00:00:00 1970 From: gigin_jose@yahoo.co.in (GIGIN JOSE) Date: Mon, 22 Aug 2011 09:17:43 +0000 (UTC) Subject: USB host on s3c2416 Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, I am working on samsung s3c2416 ARM based Soc on linux 2.6.21 kernel. By default, the Soc has one USB host and one USB device/host. My USB host is working fine. Since I need to use two USB host on my system, I need to enable the USB device/host as a USB host. The following are the changes I have made for the same: Register Address value ----------------------------- PHYPWR 0x4C00_0084 0x0 PWRCFG 0x4C00_0060 (1<<4) URSTCON 0x4C00_0088 (0<<2)|(1<<1)|(1<<0) URSTCON 0x4C00_0088 (0<<2)|(0<<1)|(0<<0) PHYCTRL 0x4C00_0080 (0<<3)|(0<<2)|(1<<1)|(1<<0) UCLKCON 0x4C00_008C 0<<31)|(0<<2)|(1<<1)|(1<<0) Once I try to plug in a USB mass storage device (whose driver is present in kernel), I get the following error: usb 1-2: new full speed USB device using s3c2410-ohci and address 10 usb 1-2: device descriptor read/64, error -62 usb 1-2: device descriptor read/64, error -62 usb 1-2: new full speed USB device using s3c2410-ohci and address 11 usb 1-2: device descriptor read/64, error -62 usb 1-2: device descriptor read/64, error -62 usb 1-2: new full speed USB device using s3c2410-ohci and address 12 usb 1-2: device not accepting address 12, error -62 usb 1-2: new full speed USB device using s3c2410-ohci and address 13 usb 1-2: device not accepting address 13, error -62 Why is it throwing this error ? Is there any driver for USB hub missing in 2.6.21 kernel, or do I need to modify more on register settings. Please help. Thank You GIGIN