Is this due to a problem with my flash

[laurentc]

Hello

I am using the sparkfun dev board called the "ESP8266 Thing".
It is provided with a 512Kbits AT25SF041-SSHD-B flash.
I was able to flash AT Firmware, make evaluations. Connect in WIFI, make UDP, TCP. That Was OK.
I changed the flash to a blank 1MB AT25DF081A-SSH-B to go further with your last SDK.
With It, I tried the "AT firmware which can upgrade by "AT+CIUPDATE"
The only way to avoid having a checksum problem on boot (the flash tool makes no check it seems)
was to make it run at 20Mhz with DOUT SPI mode.
But, still, now I get this message on reboot

"
ets Jan 8 2013,rst cause:2, boot mode:(3,7)

load 0x40100000, len 1396, room 16
tail 4
chksum 0x89
load 0x3ffe8000, len 776, room 4
tail 4
chksum 0xe8
load 0x3ffe8308, len 540, room 4
tail 8
chksum 0xc0
csum 0xc0

2nd boot version : 1.4(b1)
SPI Speed : 20MHz
SPI Mode : DOUT
SPI Flash Size & Map: 8Mbit(512KB+512KB)
jump to run user1 @ 1000

RTC dÐHfxP Ih-áêî
SDK ver: 1.2.0 compiled @ Jul 3 2015 19:36:17
phy ver: 356, pp ver: 8.7

nv version:ver0
[W]sec 7d error
[W]sec 7d error
[W]sec 7d error
etc...
"

and it then loops with these messages.

What does that mean ? Is this again a problem with the flash ?
If yes, isn't this flash reference supposed to work well with the ESP ?

thank you

[ESP_Faye]

Hi,

1. AT firmware needs 1MBytes flash.

2."[W]sec 7d error" means the sector 7d of your flash can not be write. Please try to test it with another module or another flash.

Thanks for your interest in ESP8266 !