grub2 is slow to access ata disk

[Thierry Bultel]

Hi,

I was previously using grub2-2.00, and recently upgraded to the master 
branch.
My boot device is a compact flash.

Here is my grub-mkimage command, with the builtin modules:

/shared/buildroot/buildroot_agv_v15_ark/host/usr/bin/grub-mkimage -d 
/shared/buildroot/buildroot_agv_v15_ark/host/usr/lib/grub/i386-pc -O 
i386-pc -o /shared/buildroot/buildroot_agv_v15_ark/images/grub.img -p 
"(ata0,msdos1)/boot/grub"  boot pata linux ext2 fat part_msdos part_gpt 
part_bsd normal sleep echo video videoinfo help jpeg uhci ehci usb 
usb_keyboard usbms usbtest gfxterm gfxterm_background gfxmenu vbe vga 
video_bochs video_cirrus font search search_fs_file search_label test 
test_blockarg keylayouts at_keyboard cat configfile loadenv eval serial 
regexp

When I was using 2.00, I had "biosdisk" instead of "pata" and
it worked fine, and it was fast.

With the master branch, "ls" lists nothing if I keep "biosdisk".

However, it somehow works' if I replace "biosdisk" by "pata", the 
partitions
of the compact flash are listed. But it is very slow, about 2 to 3 
seconds, and I am getting "error: no device connected" 6 times.

The kernel loading is very slow as well.
If there possibly something wrong with my configuration ?

Thanks
Thierry