Part III. Non-Volatile Variables Reference

Part III shows the available non-volatile variables.

These nvram variables are available and usable in ABLE version 2.20 or later. Any variables which are not available on all platforms will be marked as such in their description section.

Each variable is documented in a format similar to the UNIX® manual page layout. The page is separated into several parts:

Name - The name of the variable and its purpose.
Description - Describes the variable in detail.
Platforms - This optional section describes the platforms which use the variable is present, if not present the variable is available on all platforms.
See also - This optional section gives references to other variables which may be relevant.

Table 9. Alphabetical list of non-volatile variables

VariablePurpose
boot.autoEnable auto boot
boot.cmdCommand line to use for auto boot
boot.timeoutTime to wait before auto boot
boot.fsThe filesystems to be scanned by the autoboot command.
console.writeDefault Console output stream
console.readDefault Console input stream
console.levelConsole logging level
fb.enableFramebuffer driver - enable output
fb.outputFramebuffer driver - output target
fb.xFramebuffer driver - Display X size (width)
fb.yFramebuffer driver - Display Y size (height)
fb.refreshFramebuffer driver - Display refresh frequency
ide.multi-limitIDE multiple sector read limit
shell.histShell history depth
sys.autoshadowWhether able will automatically moved into RAM at system start
sys.speedSystem speed set at start time
usb.enableUSB system enable
usb.hubdepthUSB system depth hubs should be searched for devices to

Table of Contents

boot.auto — Enable auto boot
boot.cmd — Command line to use for auto boot
boot.timeout — Time to wait before auto boot
boot.fs — The filesystems to be scanned by the autoboot command.
console.write — Default Console output stream
console.read — Default Console input stream
console.level — Console logging level
fb.enable — Framebuffer driver - enable output
fb.output — Framebuffer driver - output target
fb.x — Framebuffer driver - Display X size (width)
fb.y — Framebuffer driver - Display Y size (height)
fb.refresh — Framebuffer driver - Display refresh frequency
ide.multi-limit — IDE multiple sector read limit
shell.hist — Shell history depth
sys.autoshadow — Determines if ABLE will automatically moved into RAM at system start
sys.speed — System speed set at start time
usb.enable — USB system enable
usb.hubdepth — USB system depth hubs should be searched for devices to