Technical data

Starting Up and Shutting Down the System
4.7 Writing a New Boot Block on the System Disk
Use the device name format described in the upgrade and installation
documentation for your processor. If you want to boot using a bootstrap
image other than the default, you must specify the full file specification of the
image, including device and directory.
3. The procedure displays the following message:
Enter VBN of boot file code (default is one):
Ordinarily, the boot code is located at virtual block number (VBN) 1 of the
bootstrap image. Press Return to accept the default value of 1.
4. The procedure displays the following message:
Enter load address of primary bootstrap in HEX (default is 200):
The load address is the location in memory (specified in hexadecimal
notation) to which the system loads the bootstrap image. Ordinarily you
copy the bootstrap image to address 200. Press Return to accept the default
value of 200.
5. The Writeboot utility writes the information you specified to the boot block
(block 0) on the system disk.
On Alpha systems, follow these steps to use the Writeboot utility:
1. To start the Writeboot utility, enter the following command:
$ RUN SYS$SYSTEM:WRITEBOOT
The procedure asks you whether you want to write the VAX portion of the
boot block:
Update VAX portion of boot block (default is Y):
2. Enter NO.
3. The utility displays the following prompt:
Update Alpha portion of boot block (default is Y):
Press Return to accept the default value of Y.
4. The utility prompts you for the Alpha bootstrap image:
Enter Alpha boot file:
On Alpha systems, APB.EXE is the default bootstrap image. Enter a response
in the following format:
device:[VMS$COMMON.SYSEXE]APB.EXE;
where device specifies the device name of the system disk.
5. The Writeboot utility writes the information you specified to the boot block
(block 0) on the system disk.
On VAX and Alpha systems, the Writeboot utility might display one or more of
the following error messages:
• ‘‘You lack LOG_IO privilege.’’
This message means you do not have the correct privilege to use the Writeboot
utility.
• ‘‘You lack READ and/or WRITE access to TARGET DEVICE. DISMOUNT and
reMOUNT it.’’
4–20 Starting Up and Shutting Down the System