Hi, Iwamatsu-san, thank you for your advice. I before enabled CONFIG_USB_SISUSBVGA=m and CONFIG_USB_SISUSBVGA_CON=y in kernel config and built kernels. I have aleady tested many X applications on sain-ha-vga. But framebuffer does not work. And framebuffer application(for example jfbterm) dose not work. So, I want to know how to work framebuffer and framebuffer applications. Best regards, Isaka