The upgrade script for the openmesh sysupgrade procedure used always an 1
byte block size. This made it easier to seek the correct position in the CE
image and to make sure the right amount of data was copied. But this also
meant that the reading/writing of data required an excessive amount of
syscalls and copy operations.
A 5.4MB big sysupgrade image on an OM2P-HS v3 needed roughly 120s for the
write operation (170s in total) during the sysupgrade.
But it is possible to reduce this overhead slightly:
* index access to read the file size can be done in single 8 byte chunk
(while doing the seek with byte granularity) because each size entry is
example 8 bytes long
* the fwupgrade.cfg can be read as one block (while seeking to its position
using its actual byte offset) because it should be rather small and fit
into the RAM easily
* the kernel can be read in 1KB blocks (while seking to its positions using
its actual byte offset) because the the size of the kernel is always a
multiple of the NOR flash block size (64KB and 256KB)
This results in a sysupgrade write time of roughly 90s (140s in total).
This could be reduced even further when also using larger chunks for the
rootfs. But the squashfs rootfs image is at the moment always
(256KB or 64KB) * block + 4 bytes
long. It would be expected that the time for the sysupgrade write could be
reduced to roughly 30s (80s in total) when busybox's dd would support
the iflag count_bytes.
Reported-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Device specifications:
======================
* Qualcomm/Atheros QCA9533 v2
* 650/600/217 MHz (CPU/DDR/AHB)
* 64 MB of RAM
* 16 MB of SPI NOR flash
- 2x 7 MB available; but one of the 7 MB regions is the recovery image
* 2x 10/100 Mbps Ethernet
* 1T1R 2.4 GHz Wi-Fi
* 6x GPIO-LEDs (3x wifi, 2x ethernet, 1x power)
* 1x GPIO-button (reset)
* external h/w watchdog (enabled by default)
* TTL pins are on board (arrow points to VCC, then follows: GND, TX, RX)
* 2x fast ethernet
- eth0
+ Label: Ethernet 1
+ 24V passive POE (mode B)
- eth1
+ Label: Ethernet 2
+ 802.3af POE
+ builtin switch port 1
* 12-24V 1A DC
* external antenna
Flashing instructions:
======================
Various methods can be used to install the actual image on the flash.
Two easy ones are:
ap51-flash
----------
The tool ap51-flash (https://github.com/ap51-flash/ap51-flash) should be
used to transfer the image to the u-boot when the device boots up.
initramfs from TFTP
-------------------
The serial console must be used to access the u-boot shell during bootup.
It can then be used to first boot up the initramfs image from a TFTP server
(here with the IP 192.168.1.21):
setenv serverip 192.168.1.21
setenv ipaddr 192.168.1.1
tftpboot 0c00000 <filename-of-initramfs-kernel>.bin && bootm $fileaddr
The actual sysupgrade image can then be transferred (on the LAN port) to
the device via
scp <filename-of-squashfs-sysupgrade>.bin root@192.168.1.1:/tmp/
On the device, the sysupgrade must then be started using
sysupgrade -n /tmp/<filename-of-squashfs-sysupgrade>.bin
Signed-off-by: Sven Eckelmann <sven@narfation.org>
[wrap two very long lines, fix typo in comment]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
