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Re: grub in mac

From: Andrei Borzenkov
Subject: Re: grub in mac
Date: Wed, 11 Nov 2015 06:43:14 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 
11.11.2015 06:29, Peter Cheung пишет:

Thanks i changed the device.map but still getting the same error :-(

cat device.map

(hd0) /dev/disk2


$base/sbin/grub-bios-setup --no-rs-codes -m device.map -c 
../../`pwd`/temp/boot/grub/core.img -b 
../../toolchain/lib/grub/i386-pc/boot.img $deviceName

/toolchain/sbin/grub-bios-setup: error: guessing the root device failed, 
because of `disk `hostdisk//dev/rdisk1' not found'.




Could you add --verbose to grub-bios-setup and provide output?

Also try grub-bios-setup ... '(hd0)' instead of passing OS device.





Subject: Re: grub in mac
To: address@hidden
From: address@hidden
Date: Wed, 11 Nov 2015 06:18:38 +0300
CC: address@hidden

11.11.2015 06:05, Peter Cheung пишет:

Hi    yes, it is a loopback device in mac,
/Users/peter>diskutil list
/dev/disk0 (internal, physical):
     #:                       TYPE NAME                    SIZE       IDENTIFIER
     0:      GUID_partition_scheme                        *251.0 GB   disk0
     1:                        EFI EFI                     209.7 MB   disk0s1
     2:          Apple_CoreStorage Macintosh HD            250.1 GB   disk0s2
     3:                 Apple_Boot Recovery HD             650.1 MB   disk0s3
/dev/disk1 (internal, virtual):
     #:                       TYPE NAME                    SIZE       IDENTIFIER
     0:                  Apple_HFS Macintosh HD           +249.8 GB   disk1
                                   Logical Volume on disk0s2
                                   AD00F0B6-B785-409F-B32F-F77FE8E2108E
                                   Unlocked Encrypted
/dev/disk2 (disk image):
     #:                       TYPE NAME                    SIZE       IDENTIFIER
     0:     FDisk_partition_scheme                        +104.9 MB   disk2
     1:                 DOS_FAT_32 A                       104.8 MB   disk2s1
/Users/peter>
This is my device.map:
/Users/peter>cat NetBeansProjects/PeterI/device.map
(hd0) /dev/loop0
The device.map work in linux, no sure it is the problem or not.thanksfrom Peter


Do you have /dev/loop0 in OS X? You probably should have

(hd0) /dev/disk2


there.



Date: Tue, 10 Nov 2015 10:02:28 +0300
Subject: Re: grub in mac
From: address@hidden
To: address@hidden
CC: address@hidden

On Tue, Nov 10, 2015 at 9:59 AM, Peter Cheung <address@hidden> wrote:

Hi Andrei
      the $deviceName is /dev/disk2, which is correct because i can see it
using mac command "diskutil list".

I am create a single file, containing a partition. I will use bochs emulator
to boot that single file FS image.



Is it something similar to Linux loop device then? I.e. /dev/disk2
actually refers to this file you mention? Correct? What is in your
device.map?


thanks
from Peter


Date: Tue, 10 Nov 2015 09:27:19 +0300
Subject: Re: grub in mac
From: address@hidden
To: address@hidden
CC: address@hidden




On Tue, Nov 10, 2015 at 7:33 AM, Peter Cheung <address@hidden>
wrote:

hi,
i am nearly able to build a file system image with FAT partition in mac,
but i stuck in this command:



Do you mean you create hard disk image and want to install GRUB on this
image?


sudo $base/sbin/grub-bios-setup --no-rs-codes -m device.map -c
../../`pwd`/temp/boot/grub/core.img -b
../../toolchain/lib/grub/i386-pc/boot.img $deviceName


And what is $deviceName?


/toolchain/sbin/grub-bios-setup: error: attempt to read or write outside
of
disk `hostdisk//dev/disk2'.



This means GRUB does not detect $deviceName as device available at
boot time. Usual big hammer is suitable device.map.


I cross compiled my grub by :

./configure --prefix=$PREFIX --target=i586-peter-elf

Any tips?


Below is my script to make the fs image:

base=/toolchain

rm -fr hd.img

tempDeviceName=`hdiutil info|grep FDisk|cut -d$'\t' -f1`

hdiutil eject $tempDeviceName

commands=( `which dd` `which kpartx` $base/bin/grub-mkimage
$base/sbin/grub-bios-setup )

error="false"

for c in address@hidden; do

if [ ! -x $c ]; then

echo "************************************************************";

echo "$c not found!";

echo "************************************************************";

error="true";

fi

done


if [ "$error" == "true" ]; then

exit;

fi


dd if=/dev/zero of=hd.img count=10240 bs=10240

#kpartx -d hd.img

deviceName=`hdiutil attach -imagekey diskimage-class=CRawDiskImage
-nomount
hd.img`

deviceName=${deviceName//[[:space:]]/}

echo "deviceName="$deviceName


umount temp

rm -fr temp

mkdir temp

# create partition

diskutil partitionDisk $deviceName MBRFormat "MS-DOS FAT32" "A" 100%

umount /Volumes/a

# end create partition

mount -t msdos $deviceName"s1" temp

mkdir -p temp/boot/grub

cp grub.cfg temp/boot/grub/

cp kernel/kernel temp/boot/


# setup grub

echo "(hd0) /dev/loop0" > device.map

echo "set prefix=(hd0,msdos1)/boot/grub" > mycfg.cfg


$base/bin/grub-mkimage --config=mycfg.cfg -p /boot -O i386-pc -o
temp/boot/grub/core.img biosdisk part_msdos fat vbe vga echo configfile
multiboot multiboot2

cp $base/lib/grub/i386-pc/boot.img temp/boot/grub/


$base/sbin/grub-bios-setup --no-rs-codes -m device.map -c
../../`pwd`/temp/boot/grub/core.img -b
../../toolchain/lib/grub/i386-pc/boot.img $deviceName

# end setup grub


umount temp

#kpartx -d hd.img

hdiutil eject $deviceName

rm -fr temp

rm -fr device.map

rm -fr mycfg.cfg


thanks
from Peter (address@hidden)

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