Which types of SPI Flash are compatible with ROM for booting?

Rayman

I'm trying with a SST26VF064 instead of a Winbond chip and it doesn't seem to work...

Does only Winbond flash work?

jmg

What does a scope show ?
FWIR, boot uses only a minimal subset of FLASH, with 03H = Std Read, 3 byte Address, so the only issues should come with the very large 32b address parts.

evanh

There is a required 10k pullup on pin61 (spi_cs) for triggering the booting of the SPI part.

Rayman

I added that pullup by hand...

Peter Jakacki

Jump into TAQOZ in ROM and type .SF which will print the ID and serial number for the flash.
There are plenty of other operations you can do to write and read and dump the flash and even use lsio to check the pins.

Rayman

Sounds useful. But, I don't know how to get into TAQOZ. Funny, not mentioned in documentation yet...

Ok, I found it greater than, space, escape...

Peter Jakacki

After a reset and from the terminal at any baud but try 115200 (although I use 2M) the 3 characters [>] [SPACE] [ESC]
This will bring you into TAQOZ

Cold start
-------------------------------------------------------------------------------
  Parallax P2  .:.:--TAQOZ--:.:.  V1.1--v33h         190219-1900
-------------------------------------------------------------------------------
TAQOZ#

Now try the .SF command

TAQOZ# .SF --- $EF70_1800 $0F28_0A23_$E468_5CF4 ok

Check for pull-ups etc with lsio

TAQOZ# lsio --- 
P:00000000001111111111222222222233333333334444444444555555555566
P:01234567890123456789012345678901234567890123456789012345678901
=:~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~h ok

Dump some Flash memory:

TAQOZ# 0 $40 SF DUMP --- 
00000: FF FF FF FF  FF FF FF FF  FF FF FF FF  FF FF FF FF     '................'
00010: FF FF FF FF  FF FF FF FF  FF FF FF FF  FF FF FF FF     '................'
00020: FF FF FF FF  FF FF FF FF  FF FF FF FF  FF FF FF FF     '................'
00030: FF FF FF FF  FF FF FF FF  FF FF FF FF  FF FF FF FF     '................' ok

Write some stuff (the TAQOZ dictionary) to Flash, then dump it, erase it, and check it.

TAQOZ# @WORDS 0 $100 SFWRS ---  ok
TAQOZ# 0 $40 SF DUMP --- 
00000: 03 44 55 50  73 00 04 4F  56 45 52 77  00 04 53 57     '.DUPs..OVERw..SW'
00010: 41 50 7E 00  03 52 4F 54  82 00 04 2D  52 4F 54 81     'AP~..ROT...-ROT.'
00020: 00 04 44 52  4F 50 69 00  03 33 52 44  79 00 03 34     '..DROPi..3RDy..4'
00030: 54 48 7B 00  05 32 44 52  4F 50 68 00  05 33 44 52     'TH{..2DROPh..3DR' ok
TAQOZ# SFERASE ---  ok
TAQOZ# 0 $40 SF DUMP --- 
00000: FF FF FF FF  FF FF FF FF  FF FF FF FF  FF FF FF FF     '................'
00010: FF FF FF FF  FF FF FF FF  FF FF FF FF  FF FF FF FF     '................'
00020: FF FF FF FF  FF FF FF FF  FF FF FF FF  FF FF FF FF     '................'
00030: FF FF FF FF  FF FF FF FF  FF FF FF FF  FF FF FF FF     '................' ok

Rayman

Ok, thanks, I'm seeing something that makes it look like it's working:

Rayman

Do you need a new loader to program flash with Rev.B?

That must be it... Can't do flash on Eval board B either...

evanh

Eric has started working on that for loadp2, based off Brian's demo - https://forums.parallax.com/discussion/169608/prop2-flash-loader/p1

At the moment, that demo pasm2 source for binding a programmer/booter to top of target source is only one I think. Maybe Catalina has something, but I think it's only for prop1 I2C chips. EDIT: Looks like Ross has added it to Catalina alright - https://forums.parallax.com/discussion/comment/1472321/#Comment_1472321

CJMJ

I'm testing a Rev C eval board I just received. Jumped into TAQOZ and type .SF. What I got back was $FFFF_FFFF $FFFF_FFFF_$FFFF_FFFF ok. Does that look right?

VonSzarvas

Have you got the flash dip-switch turned on ?

ManAtWork

This old thread might help: http://forums.parallax.com/discussion/171108/spi-boot-rom-compatibility-tests
On page 2 there's a list of devices I have tested.
http://forums.parallax.com/discussion/comment/1487989/#Comment_1487989

It seems that the SST chips don't fit very well to the P2.

CJMJ

VonSzarvas was correct. I did not have the flash dip-switch turned on. I misunderstood the documentation. I'll have to review the datasheet for the flash. With the flash dip-switch on, TAQOZ's .sf word gives me: $EF70_1800 $C74F_3C39_$E469_C078 ok. I have to make a note of this. Thanks.