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grub2 is slow to access ata disk

From: Thierry Bultel
Subject: grub2 is slow to access ata disk
Date: Tue, 24 Feb 2015 17:59:32 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0


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 ?


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