*/
The 'pxe' commands provide a near subset of the functionality provided by
-the PXELINUX boot loader. This allows U-boot based systems to be controlled
-remotely using the same PXE based techniques that many non U-boot based servers
+the PXELINUX boot loader. This allows U-Boot based systems to be controlled
+remotely using the same PXE based techniques that many non U-Boot based servers
use.
Commands
lines is ignored.
The size of pxe files and the number of labels is only limited by the amount
-of RAM available to U-boot. Memory for labels is dynamically allocated as
+of RAM available to U-Boot. Memory for labels is dynamically allocated as
they're parsed, and memory for pxe files is statically allocated, and its
location is given by the pxefile_addr_r environment variable. The pxe code is
not aware of the size of the pxefile memory and will outgrow it if pxe files
Differences with PXELINUX
=========================
-The biggest difference between U-boot's pxe and PXELINUX is that since
-U-boot's pxe support is written entirely in C, it can run on any platform
-with network support in U-boot. Here are some other differences between
-PXELINUX and U-boot's pxe support.
+The biggest difference between U-Boot's pxe and PXELINUX is that since
+U-Boot's pxe support is written entirely in C, it can run on any platform
+with network support in U-Boot. Here are some other differences between
+PXELINUX and U-Boot's pxe support.
-- U-boot's pxe does not support the PXELINUX DHCP option codes specified
+- U-Boot's pxe does not support the PXELINUX DHCP option codes specified
in RFC 5071, but could be extended to do so.
-- when U-boot's pxe fails to boot, it will return control to U-boot,
- allowing another command to run, other U-boot command, instead of resetting
+- when U-Boot's pxe fails to boot, it will return control to U-Boot,
+ allowing another command to run, other U-Boot command, instead of resetting
the machine like PXELINUX.
-- U-boot's pxe doesn't rely on or provide an UNDI/PXE stack in memory, it
- only uses U-boot.
+- U-Boot's pxe doesn't rely on or provide an UNDI/PXE stack in memory, it
+ only uses U-Boot.
-- U-boot's pxe doesn't provide the full menu implementation that PXELINUX
+- U-Boot's pxe doesn't provide the full menu implementation that PXELINUX
does, only a simple text based menu using the commands described in
this README. With PXELINUX, it's possible to have a graphical boot
- menu, submenus, passwords, etc. U-boot's pxe could be extended to support
+ menu, submenus, passwords, etc. U-Boot's pxe could be extended to support
a more robust menuing system like that of PXELINUX's.
-- U-boot's pxe expects U-boot uimg's as kernels. Anything that would work
- with the 'bootm' command in U-boot could work with the 'pxe boot' command.
+- U-Boot's pxe expects U-Boot uimg's as kernels. Anything that would work
+ with the 'bootm' command in U-Boot could work with the 'pxe boot' command.
-- U-boot's pxe only recognizes a single file on the initrd command line. It
+- U-Boot's pxe only recognizes a single file on the initrd command line. It
could be extended to support multiple.
-- in U-boot's pxe, the localboot command doesn't necessarily cause a local
+- in U-Boot's pxe, the localboot command doesn't necessarily cause a local
disk boot - it will do whatever is defined in the 'localcmd' env
variable. And since it doesn't support a full UNDI/PXE stack, the
type field is ignored.
-- the interactive prompt in U-boot's pxe only allows you to choose a label
+- the interactive prompt in U-Boot's pxe only allows you to choose a label
from the menu. If you want to boot something not listed, you can ctrl+c
- out of 'pxe boot' and use existing U-boot commands to accomplish it.
+ out of 'pxe boot' and use existing U-Boot commands to accomplish it.
projects / people / ms / u-boot.git / blobdiff