uboot: change char sequence for stopping autoboot

[ffissore]

Currently, when a Bridge powered sketch is running and the linux side is reset, Bridge sketch will send random chars to Serial1 and therefore stop uboot from autobooting the linux side.

[ffissore]

Released in 29242a5

[arve0]

This is still a problem with 1.5.0 (here I press w):

U-Boot 1.1.4-gd995931a-dirty (Aug  7 2013 - 16:16:04)

Arduino Yun (ar9331) U-boot

DRAM:  64 MB
Top of RAM usable for U-Boot at: 84000000
Reserving 142k for U-Boot at: 83fdc000
Reserving 192k for malloc() at: 83fac000
Reserving 44 Bytes for Board Info at: 83fabfd4
Reserving 36 Bytes for Global Data at: 83fabfb0
Reserving 12k forboot aram() a: 83fbfb0
                                       Stac Poiter t: 838bf98
                                                             Now running in RAM - U-Boot at: 83fdc000
Flash Manuf Id 0xef, DeviceId0 0x40, DeviceId1 0x18
flash size 16777216, sector count =256
                                      Flas: 16 B
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   ag7240_enet_initialize...
No valid address in Flash. Using fixed address
No valid address in Flash. Using fixed address
: cfg1 0x5 cfg2 0x7114
eth0: 00:03:7f:09:0b:ad
eth0 up
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
athrs26_reg_init_lan
ATHRS26: resetting s26
ATHRS26: s26 reset done
eth1 up
eth0, eth1
Hit any key to stop autoboot:  0 
ar7240>

MD5 of downloaded 1.5.0:

probook:YunImage_v1 arve$ md5 *
MD5 (openwrt-ar71xx-generic-linino-u-boot.bin) = 0c7d9f824bcd7db5538eda1328e00190
MD5 (openwrt-ar71xx-generic-yun-16M-kernel.bin) = 3a267ba5e278bffaff51c96dfc33ab22
MD5 (openwrt-ar71xx-generic-yun-16M-rootfs-squashfs.bin) = de6740cabee356afdb391f27cf340c00

[ffissore]

The MD5s are right. It looks like you haven't upgraded uboot: the compile date shown is Aug 7 2013; it should be at least 2014 (my dev board says Oct 2 2014). Have you followed this tutorial?

[arve0]

Yes, I followed the tutorial. Here is the output:

ar7240> set serverip 169.254.20.231;
ar7240> set ipaddr 169.254.20.230;
ar7240> tftp 0x80060000 openwrt-ar71xx-generic-linino-u-boot.bin;
dup 1 speed 100
Using eth0 device
TFTP from server 169.254.20.231; our IP address is 169.254.20.230
Filename 'openwrt-ar71xx-generic-linino-u-boot.bin'.
Load address: 0x80060000
Loading: ###########
done
Bytes transferred = 55692 (d98c hex)

[ffissore]

That's about downloading: have you also reflashed it? erase and cp.b commands later in the doc

[arve0]

Ahh, thanks!