Hi Luiz,
This is Luiz and I'm working with Robert in this project.
Glad to hear he's got someone to grow grey hairs with ... if it hasn't fallen out yet.
Actually, I'm a hardware guy.
So am I ... this week :)
I read your messages and it seems you're right. However, before introducing these changes on the board, we decided to verify all flash circuitry and we noticed the following:
CE# is OK! WE# is OK! OE# is OK!
We verified it using a scope and triggering CE# pin. After that, we tried to write to flash through BDI2000 using "mm" command. Again with a scope we checked each address line and apparently everything is fine with the address.
I think that after the processor boots LAD[0:31] activate for each address access, its only during boot that LAD[27:31] do not toggle, and you have to use LA[27:31]. So its that confirmation of the address toggles in this case just confirms that the LAD[27:31] bits toggle.
On the bright-side, it sounds like you have the bit ordering correct ([27:30])... just not the right bits (LAD vs LA).
We also checked the data being written, and it's ok too. After that, in order to validate the written, we read the same address we had just written. But we got a different value. Therefore we are not writing correctly to flash.
Have you tried using simple CFI flash commands; read the manufacturer ID, read the device ID, read the sector protection? Don't bother with BDI Flash commands just yet, just use memory read/write commands.
Ok, after all, we fixed our board following your tips. We connected LA[27:30] to A[3:0] and A[4:25] to LBA[26:5]. But we got the same bad result. I mean we read a wrong data.
After, we changed flash access time, decreasing it. And the problem persisted. We changed flash chip and nothing happened.
Actually I'm afraid because I can't see what else we can verify on hardware.
My opinion is we have mistakes on configuration file. I'm not sure if we are configuring all registers correctly.
Do you think it would be helpful if I send you our flash schematic and our configuration file?
Sure, no guarantees, you can send me a copy, or send a link to the group. I'm not too knowledgeable on BDI config files yet, as I don't have my custom hardware. However, I have looked at a few hardware designs, so perhaps I'll spot something on the schematic. The peripherals seem to be pretty similar between the PowerQUICCs, so I'll dig up a working configuration file, and look at the difference in register settings.
What is your Flash? Eg. if its say a Spansion device, do you have WP# tied high, BYTE# tied low/high, etc? Are there any address pins left floating?
Do you have a logic analyzer available? If you did, you'd be able to look at the flash controls and write-data and convince yourself that your Flash programming sequence was correct.
The best advice at the moment, is to access your Flash configuration using manual read/write sequences.
Cheers, Dave