Proper configuration of /etc/fw_printenv for U-boot on TP1

[phireph0x]

I'm attempting to modify my U-boot settings but first want to print out the current settings. I'm using the fw_printenv command as instructed elsewhere, but it's not printing the entire contents. Apparently the Device offset, Env size or Flash sector size settings are incorrect in /etc/fw_printenv.config. I've tried each of the following settings

$this->bbcode_second_pass_code('', '# For old factory standard Sheevaplug
#/dev/mtd0 0xa0000 0x20000 0x20000

# For eSata Sheevaplug with u-boot prior to 2013.04
#/dev/mtd0 0x60000 0x20000 0x20000

# For eSata Sheevaplug with u-boot after 2013.04
#/dev/mtd0 0x80000 0x20000 0x20000

#/dev/mtd0 0x40000 0x20000 0x20000')

But each time receive the following error

$this->bbcode_second_pass_code('', '$ sudo fw_printenv
Warning: Bad CRC, using default environment
bootcmd=bootp; setenv bootargs root=/dev/nfs nfsroot=${serverip}:${rootpath} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off; bootm
bootdelay=5
baudrate=115200')

What are the proper /etc/fw_printenv.config values for TonidoPlugv1?