On Tue, Jun 14, 2016 at 8:41 PM, vinoth eswaran evinoth1206@gmail.com wrote:

Hello Mr.Bin,

In the latest U-boot-x86 version I am seeing some error messages when I enable the debug messages in the bios.c file.

I am checking the VESA driver initialization and it seems that for a particular functional call it takes more time to process. realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff, 0x0, 0x0); -- it takes around 2 seconds. Do you have any idea how to optimize this function call or why it is taking that much time.

This is 16-bit BIOS call. It is expected that it is slow.

I tried to enable the debug messages to understand what is happening and found that there are some software interrupts that are not supported

[0.325805 0.002018] Real mode stub @600: 919 bytes [0.328829 0.003024] Calling Option ROM at c0000, pci device 0x10... [1.850796 1.521967] Unsupported software interrupt #0x15 eax 0x90005f14 [1.877799 0.027003] Unsupported software interrupt #0x15 eax 0x5f35 [1.977798 0.099999] done [1.978944 0.001146] VBE: Getting information about VESA mode 411a

How can I disable this software interrupts ?

INT15 is Intel's custom vgabios call. This can be ignored, since it is working.

Regards, Bin