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I read some instructions for modifying the RPi that would require the cmdline.txt to be modified.

Unfortunately I have nothing but the Raspberry itself to mount the SD card, so I wonder whether I can mount the FAT32 partition of which the Raspberry booted, then modify the cmdline.txt from nano and then reboot.

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If you are trying to do this on the Pi, then the partition should be mounted, by default, in /boot. So just edit /boot/cmdline.txt

There should be no need to edit cmdline.txt in normal circumstances. There are lots of old instructions suggesting this, but virtually everything can be done more safely with raspi-config.

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  • He may need to modify /etc/fstab. It looks like /dev/mmcblk0p1 is mounted with default mount options (/dev/mmcblk0p1 /boot vfat defaults 0 2), but I don't know what they are for RPI. Do you know if default is ro or rw? – user50099 Jul 28 '16 at 4:58
  • The options I needed are not available in raspi-config. Answer worked like a charm – Thomas Weller Jul 28 '16 at 15:56
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yes you can mount the fat partition for temporarly reasons, otherwise use fstab

sudo mount -t vfat -o uid=root /dev/mmcblk0p1 /mnt
sudo nano /mnt/cmdline.txt

have fun

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