Tmpfs unusually large, is it possible to resize?

Installing and Using OpenWrt
1

My tmpfs is unusually large (122MB), while my overlayfs is only 14.4MB. Is there a way to change this?

Some info:
Device: Linksys EA9500
OpenWRT version: OpenWrt SNAPSHOT, r20337-a66f843971
df -h output:

root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 3.8M      3.8M         0 100% /rom
tmpfs                   122.3M      2.0M    120.3M   2% /tmp
/dev/ubi0_1              14.4M     12.3M      1.3M  90% /overlay
overlayfs:/overlay       14.4M     12.3M      1.3M  90% /
tmpfs                   512.0K         0    512.0K   0% /dev
2

No.

tmpfs is just a ramdisk, not flash.

3 Likes
3

Another question:

These are my mtd devices, is there a way to use one of them? I don't use all of them currently

cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00080000 00020000 "boot"
mtd1: 00100000 00020000 "nvram"
mtd2: 00080000 00020000 "devinfo"
mtd3: 01d00000 00020000 "firmware"
mtd4: 003fffe4 00020000 "linux"
mtd5: 01900000 00020000 "ubi"
mtd6: 01d00000 00020000 "backup"
mtd7: 02e00000 00020000 "system"
4

You've got two USB ports, use exroot..

5

I'm aware, but according to the device page I should have 128MB NAND

6

Your device also have a dual firmware setup, even though I can't see it in your post.

It's in the wiki though, and if correct, you'll never have more than 50% of the full flash size available...

7

Your device also have a dual firmware setup, even though I can't see it in your post.

Yeah, I've tried to flash to failsafe but it failed, and my /proc/mtd doesn't match with the wiki

Wiki:

 cat /proc/mtd:
 dev: size erasesize name
 mtd0: 00080000 00020000 "boot"
 mtd1: 00180000 00020000 "nvram"
 mtd2: 01d00000 00020000 "linux"
 mtd3: 01ad2504 00020000 "rootfs"
 mtd4: 03300000 00020000 "linux2"
 mtd5: 030d245c 00020000 "rootfs2"
 mtd6: 02e00000 00020000 "brcmnand"

Edit: Is there a way to restore the original mtd layout?

8

mtd layout is just included in the currently running image's kernel & DTS.
There is no traditional "partition table" on the flash itself.

"Flashing to failsafe" sounds strange. What have you done?

OpenWrt failsafe is a just a boot-time operation to enter serial/ssh console before the user settings are evaluated. No flashing should be required.

9

On this page: https://openwrt.org/toh/linksys/ea9500_v1#only_applicable_for_the_non-usa_model

It says to
mtd flash <filename> firmware
mtd flash <filename> failsafe

The first one works, the second one used to work but doesn't anymore

10

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