SlyGuy SlyGuy - 6 months ago 31
Bash Question

What is the difference between FS0 and BLK0 in UEFI shell mappings?

I think FS stands for filesystem, but I don't know what BLK stands for. Not only that, but what are the meanings behind the pci hierarchy parameters. i.e. When I see HD(1,MBR,0x0003B) what does "1","MBR", and what looks to be an address, stand for?

Here's the mapping table I'm looking at in UEFI shell:

Mapping table
FS0: Alias(s):HD21a0e0b:;BLK1:
PciRoot(0x0)/Pci(0x1D,0x0)/USB(0x0,0x0)/USB(0x4,0x0)/HD(1,MBR,0x0003B)
FS1: Alias(s):HD23a0a1:;BLK4:
PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x0,0x0,0x0)/HD(1,MBR,0x00000000,0x3F)
BLK3: Alias(s):
PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x0,0x0,0x0)
BLK0: Alias(s):
PciRoot(0x0)/Pci(0x1D,0x0)/USB(0x0,0x0)/USB(0x4,0x0)
BLK2: Alias(s):
PciRoot(0x0)/Pci(0x1D,0x0)/USB(0x0,0x0)/USB(0x4,0x0)/HD(2,MBR,0x0003B)


I'm guessing BLK's are available ports and FS's are physical things that are plugged into those ports. It looks like once somethign is plugged into a BLK, it becomes an FS, but still retains its BLK value. i.g. FS0=BLK1

Answer

According to archwiki:

  • fsX means filesystem
  • blkX means block device or data storage device

MBR should mean Master Boot Record

HD should mean Hard Drive

1 might mean Primary, 2 Secondary Partition

That hex number after MBR could be the device signature or disk identifier. Or maybe an offset of that device to important information.

Links that might help further:

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