The purpose of this Wiki is to test the SDRAM of the NSLU2. This is done as follows:
First, telnet into RedBoot. Once you're in RedBoot, type "version" as shown below.
RedBoot> version RedBoot(tm) bootstrap and debug environment [ROMRAM] Red Hat certified release, version 1.92 - built 15:16:07, Feb 3 2004 Platform: IXDP425 Development Platform (XScale) Copyright (C) 2000, 2001, 2002, Red Hat, Inc. RAM: 0x00000000-0x02000000, 0x000723a0-0x01ff3000 available FLASH: 0x50000000 - 0x50800000, 64 blocks of 0x00020000 bytes each.
From the available RAM space (shown above), 0x01ff3000 - 0x000723a0 = 0x01F80C60 in decimal, the result is: 33033312
in Linux or Cygwin, do this:
dd if=/dev/urandom of=RamTest.bin bs=32 count=1032291 (do a "ls -la RamTest.bin" if you want to verify size) cksum RamTest.bin (output for me showed: "163853644 33033312 RamTest.bin")
Copy the file to your TFTP server. Now in RedBoot, do this: (assume your TFTP server is 192.168.0.99)
RedBoot> load -r -v -b 0x000723a0 -h 192.168.0.99 RamTest.bin
Raw file loaded 0x000723a0-0x01ff2fff, assumed entry at 0x000723a0
(below should do a checksum of the previously transferred file)
RedBoot> cksum Computing cksum for area 0x000723a0-0x01ff3000 POSIX cksum = 163853644 33033312 (0x09c4354c 0x01f80c60)
Just to be sure, I did it again, manually, as follows:
RedBoot> cksum -b 0x000723a0 -l 0x01f80c60 POSIX cksum = 163853644 33033312 (0x09c4354c 0x01f80c60)
This is the same as the checksum produced above when we generated the file. So the slug's SDRAM memory must be good. :-)
Note that for some reason, I couldn't access (from within RedBoot) the entire 32MiB RAM. Perhaps some env vars or such are stored there and are in-use?