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README.hardware: extend USB-ZIP instructions 

* Note that on some machines booting just stops after the SYSLINUX
  version banner is displayed
* Add an instruction to show how to get the geometry information for
  the disk
* Specify the number of cylinders when running mkdiskimage as it is
  sometimes unable to detect it automatically
* Create the temporary mountpoints before attempting to use them
* Add an instruction to unmount the disk before removing it

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Paul Eggleton 2012-03-30 16:53:26 +01:00 committed by Richard Purdie
parent 501f0da47f
commit 6a11c78757
1 changed files with 32 additions and 10 deletions
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README.hardware
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@ -96,8 +96,9 @@ USB Device:
# dd if=core-image-minimal-atom-pc.hddimg of=/dev/sdb
If the device fails to boot with "Boot error" displayed, it is likely the BIOS
cannot understand the physical layout of the disk (or rather it expects a
If the device fails to boot with "Boot error" displayed, or apparently
stops just after the SYSLINUX version banner, it is likely the BIOS cannot
understand the physical layout of the disk (or rather it expects a
particular layout and cannot handle anything else). There are two possible
solutions to this problem:
@ -106,26 +107,47 @@ USB Device:
geometry from the device.
2. Without such an option, the BIOS generally boots the device in USB-ZIP
mode.
mode. To write an image to a USB device that will be bootable in
USB-ZIP mode, carry out the following actions:
a. Configure the USB device for USB-ZIP mode:
a. Determine the geometry of your USB device using fdisk:
# fdisk /dev/sdb
Command (m for help): p
Disk /dev/sdb: 4011 MB, 4011491328 bytes
124 heads, 62 sectors/track, 1019 cylinders, total 7834944 sectors
...
Command (m for help): q
b. Configure the USB device for USB-ZIP mode:
# mkdiskimage -4 /dev/sdb 0 63 62
# mkdiskimage -4 /dev/sdb 1019 124 62
Where 63 and 62 are the head and sector count as reported by fdisk.
Remove and reinsert the device to allow the kernel to detect the new
partition layout.
Where 1019, 124 and 62 are the cylinder, head and sectors/track counts
as reported by fdisk (substitute the values reported for your device).
When the operation has finished and the access LED (if any) on the
device stops flashing, remove and reinsert the device to allow the
kernel to detect the new partition layout.
b. Copy the contents of the poky image to the USB-ZIP mode device:
c. Copy the contents of the poky image to the USB-ZIP mode device:
# mkdir /tmp/image
# mkdir /tmp/usbkey
# mount -o loop core-image-minimal-atom-pc.hddimg /tmp/image
# mount /dev/sdb4 /tmp/usbkey
# cp -rf /tmp/image/* /tmp/usbkey
c. Install the syslinux boot loader:
d. Install the syslinux boot loader:
# syslinux /dev/sdb4
e. Unmount everything:
# umount /tmp/image
# umount /tmp/usbkey
Install the boot device in the target board and configure the BIOS to boot
from it.