s3c2440 開發板往SD卡寫大文件失敗的解決辦法

在 /drivers/usb/gadget/s3c2410_udc.c 中  把 s3c2410_udc_handle_ep 這個函數替換成下面這個即可：

 

static void s3c2410_udc_handle_ep(struct s3c2410_ep *ep) { struct s3c2410_request *req; int is_in = ep->bEndpointAddress & USB_DIR_IN; u32 ep_csr1; u32 idx; handle_ep_again: //add this line if (likely (!list_empty(&ep->queue))) req = list_entry(ep->queue.next, struct s3c2410_request, queue); else req = NULL; idx = ep->bEndpointAddress & 0x7F; if (is_in) { udc_write(idx, S3C2410_UDC_INDEX_REG); ep_csr1 = udc_read(S3C2410_UDC_IN_CSR1_REG); dprintk(DEBUG_VERBOSE, "ep%01d write csr:%02x %d/n", idx, ep_csr1, req ? 1 : 0); if (ep_csr1 & S3C2410_UDC_ICSR1_SENTSTL) { dprintk(DEBUG_VERBOSE, "st/n"); udc_write(idx, S3C2410_UDC_INDEX_REG); udc_write(ep_csr1 & ~S3C2410_UDC_ICSR1_SENTSTL, S3C2410_UDC_IN_CSR1_REG); return; } if (!(ep_csr1 & S3C2410_UDC_ICSR1_PKTRDY) && req) { s3c2410_udc_write_fifo(ep,req); } } else { udc_write(idx, S3C2410_UDC_INDEX_REG); ep_csr1 = udc_read(S3C2410_UDC_OUT_CSR1_REG); dprintk(DEBUG_VERBOSE, "ep%01d rd csr:%02x/n", idx, ep_csr1); if (ep_csr1 & S3C2410_UDC_OCSR1_SENTSTL) { udc_write(idx, S3C2410_UDC_INDEX_REG); udc_write(ep_csr1 & ~S3C2410_UDC_OCSR1_SENTSTL, S3C2410_UDC_OUT_CSR1_REG); return; } if ((ep_csr1 & S3C2410_UDC_OCSR1_PKTRDY) && req) { s3c2410_udc_read_fifo(ep,req); if (s3c2410_udc_fifo_count_out()) //add this line { goto handle_ep_again; //add this line } } } }