Okay, we have now gotten the TS-7300 to bootup to a Linux prompt
1.69 seconds(!) after power-up. The new SD image is available on
our FTP site:
ftp://ftp.embeddedARM.com/fastboot-7300-sdcard-7-6-2006.dd.bz2
This should be bunzip2'ed and dd'ed to the "disc" device of the
SDcard. It requires at least a 256MB SDcard. The above includes
kernel tweaks, initrd tweaks and a few tweaks inside the Debian
filesystem itself. (part3) This will completely overwrite the SD
image on the card so make sure you do the appropriate backups before
updating. To use the image on a larger card, just dd to the larger
card, use fdisk to increase the size of part3 to remaining space
(taking care to keep the same start sector), and then use
the "ext2resize" command on that partition.
The new SD image is only part of the fast boot optimizations, as we
have tweaked the TS-SDBOOT bootup firmware as well. To update to
the new TS-SDBOOT, download and run (as root) the following binary
executable on your TS-7300 board:
ftp://ftp.embeddedARM.com/sdboot-update-7-6-2006
The new SD image will look at the state of jumper 6. If JP6 is on,
the full Debian bootup will be bypassed and the system will instead
drop straight to a shell prompt. 1.69 seconds after power-on the
serial console prompt is active and 2.41 seconds after power-on the
video console is displayed. Video takes a bit longer to start up
due to the fact that the FPGA must be initialized, a splash screen
is displayed, and USB keyboard kernel modules must be loaded. To
initiate a full Debian startup, simply type "exit" at either the
shell prompt on the serial port or the shell prompt on the VGA
monitor (using the USB keyboard)
The time it takes for bootup is also displayed right before the SH
prompt is printed. On new Rev C CPLD TS-7300's, the CPLD has a 32-
bit counter that starts at 0 at poweron and is used to measure the
bootup time extremely accurately. On other boards, the EP9302
983Khz debug4 timer is used since it starts out as 0 also, but is
slightly less accurate than the 32-bit 14.7Mhz counter implemented
in the new CPLD rev.
If you want something other than a shell prompt running as soon as
possible on bootup, it is possible by editing the /linuxrc2 shell
script on the initrd. When you do the fast boot, you are actually
booting to an initrd with the Debian parts of filesystem mounted
read-only. After modifying the /linuxrc2 shell script on the
initrd, run the "save" command to save the initrd back to the SD
card, otherwise your changes won't "stick".
//Jesse Off
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