Arduino•2w ago

ESP32-S3 Linux partition table

The existent partition table is made for 8MB flash, and I am trying to add a new R/W partition that will make use of the remaining 8MB, but I have no idea how to edit the partition table or the fstab file. this post has some information but it is not clear enough for me https://github.com/jcmvbkbc/esp32-linux-build/issues/16#issuecomment-2364978673 these are the original contents of the files in question fstab

# <file system>    <mount pt>    <type>    <options>    <dump>    <pass>
/dev/root    /        ext2    rw,noauto    0    1
proc        /proc        proc    defaults    0    0
devpts        /dev/pts    devpts    defaults,gid=5,mode=620,ptmxmode=0666    0    0
tmpfs        /dev/shm    tmpfs    mode=0777    0    0
tmpfs        /tmp        tmpfs    mode=1777    0    0
tmpfs        /run        tmpfs    mode=0755,nosuid,nodev    0    0
sysfs        /sys        sysfs    defaults    0    0
mtd:etc        /etc        jffs2    nofail        0    0

# <file system>    <mount pt>    <type>    <options>    <dump>    <pass>
/dev/root    /        ext2    rw,noauto    0    1
proc        /proc        proc    defaults    0    0
devpts        /dev/pts    devpts    defaults,gid=5,mode=620,ptmxmode=0666    0    0
tmpfs        /dev/shm    tmpfs    mode=0777    0    0
tmpfs        /tmp        tmpfs    mode=1777    0    0
tmpfs        /run        tmpfs    mode=0755,nosuid,nodev    0    0
sysfs        /sys        sysfs    defaults    0    0
mtd:etc        /etc        jffs2    nofail        0    0

partition_table.esp32s3

## Label          type  ST       Offset      Length
nvs,              data, nvs,     0x0000a000, 0x00005000
phy_init,         data, phy,     0x0000f000, 0x00001000
factory,          app,  factory, 0x00010000, 0x000a0000
etc,              0x40, 0x1,     0x000b0000, 0x00070000
linux,            0x40, 0x0,     0x00120000, 0x00360000
rootfs,           0x40, 0x1,     0x00480000, 0x00380000

## Label          type  ST       Offset      Length
nvs,              data, nvs,     0x0000a000, 0x00005000
phy_init,         data, phy,     0x0000f000, 0x00001000
factory,          app,  factory, 0x00010000, 0x000a0000
etc,              0x40, 0x1,     0x000b0000, 0x00070000
linux,            0x40, 0x0,     0x00120000, 0x00360000
rootfs,           0x40, 0x1,     0x00480000, 0x00380000

3 Replies

Maverick•2w ago

I would read the docs here: https://docs.espressif.com/projects/arduino-esp32/en/latest/tutorials/partition_table.html?highlight=partion%20table https://docs.espressif.com/projects/esp-idf/en/stable/esp32s3/api-guides/partition-tables.html

bsdinisOP•2w ago

but it's still super confusing, what FS do I use to add a R/W partition, and what do I have to edit in the fstab after that? and in the first example they show offset and size as hexadecimal and in the other examples it's shown as K(B) / M(B) I added this line to the end of the partition table, not sure if it's correct spiffs, data, spiffs, 0x00800000, 0x00800000 but if it is, what do I have to edit in the fstab now?

Maverick•2w ago

I don't think you can use spiffs. The offset should probably be 0x008600000. In fstab it should probably be like etc, ie: mtd:myfs /myfs jffs2 nofail 0 0 You could probably also just increase the size of the rootfs like the github user did.

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ESP32-S3 Linux partition table

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