Need to get dword values from MBR (LBA0)

[steve6375]

Is read_dword supported? Help text at https://a1ive.github.io/grub2_cmd_zh.html suggests read_byte, read_word, read_dword, write_bytes
I want to get dword values from the MBR of a disk (hd0)0+1.
then use expr x+y to add two values
then use test x -ge y etc. to check values.
Any idea how to do this?
I can get the bytes via hexdump but this returns a string of simple bytes not a dword value.
Any help appreciated.

[a1ive]

read_byte, read_word, read_dword, write_bytes

These commands are used to read /write memory.

I want to get dword values from the MBR of a disk (hd0)0+1.
then use expr x+y to add two values
then use test x -ge y etc. to check values.

What do you want to do?

[steve6375]

I want to check that the partitions in the partition table are in order and do not overlap after switching in a .imgPTN file.

[a1ive]

I don't think we could handle dword in grub2 scripts (or other scripting languages).