(Just add the USB driver, there is no detailed description of it)
For related knowledge, you can see this related blog: http://blog.csdn.net/u012507643/article/details/52932578
1. Modify the code
vi arch/arm/mach-s3c2440/mach-smdk2440.c
#include <mach/regs-clock.h> //add by anzhihong #include <linux/delay.h>
Add the USB init function, the function definition here must be in front of the smdk_map_io call, otherwise an error will be reported: as follows
int usb_s3c2440_init(void)
{
/* Input Frequency is 12.0000MHz, and MDEV=0x38 PDIV=2 SDIV=2, so output frequency 48.00MHz */
unsigned long upllvalue = (0x38<<12)|(0x02<<4)|(0x02);
while (upllvalue != __raw_readl(S3C2410_UPLLCON))
{
__raw_writel(upllvalue, S3C2410_UPLLCON);
mdelay (1);
}
return 0;
}
In smdk2440_map_io add:
static void __init smdk2440_map_io(void)
{
s3c24xx_init_io(smdk2440_iodesc, ARRAY_SIZE(smdk2440_iodesc));
s3c24xx_init_clocks(12000000);
s3c24xx_init_uarts(smdk2440_uartcfgs, ARRAY_SIZE(smdk2440_uartcfgs));
usb_s3c2440_init(); /* Add by anzhihong */
Kernel add support:
The make menuconfig options are as follows:
Device Drivers --->
[*] USB support --->
{*} Support for Host-side USB
[*] USB device filesystem (DEPRECATED)
[*] USB device class-devices (DEPRECATED)
<*> OHCI HCD support
<*> USB Mass Storage support
[*] HID Devices --->
-*- Generic HID support
<*> USB Human Interface Device (full HID) support
SCSI device support --->
<*> SCSI device support
[*] legacy /proc/scsi/ support
<*> SCSI disk support
The usb storage driver uses the scsi intermediate layer to virtualize the usb storage device into a scsi logical device. In this way, it is convenient to use the device IO interface driven by scsi, as well as mechanisms such as plugin/plugout
File systems --->
DOS/FAT/NT Filesystems --->
<*> MSDOS fs support
<*> VFAT (Windows-95) fs support
(437) Default codepage for FAT
(iso8859-1) Default iocharset for FAT
<*> NTFS file system support
[*] NTFS write support
Partition Types --->
[*] PC BIOS (MSDOS partition tables) support
[*] Windows Logical Disk Manager (Dynamic Disk) support
-*- Native language support --->
<*> Codepage 437 (United States, Canada)
<*> Simplified Chinese charset (CP936, GB2312)
<*> ASCII (United States)
<*> NLS ISO 8859-1 (Latin 1; Western European Languages)
<*> NLS UTF-8
Recompile and load into the kernel:
Inserting the usb into the above shows the following display (I inserted all four usbs and tried it):
