AM3359 GPMC can not work

xiaowei yu

Prodigy 110 points

hi, all

I am trying to use gpmc to connect FPGA in sys/bios 6.41 at ICE-AM3359, but failed.

the problem is that , when i write or read the GPMC memory region, the cs2 pin ,we pin did not give any low signal.

my project steps are below

1, MMUInit (include cs2 memory region)

2, pinmuxconfig

3, enable clock to GPMC module

4,PinMuxConfig (select mode 0)

5,GPMCModuleSoftReset

6,config register 1 ~ 7

my config : 16bit , w/r Asynchronous ,NOR Flash like , Non-multiplexed attached device,

the value is

(*(volatile unsigned long*)(0x50000000 + 0xc0)) = 0x00001000;

(*(volatile unsigned long*)(0x50000000 + 0xc4)) = 0x00080800;

(*(volatile unsigned long*)(0x50000000 + 0xc8)) = 0x00020201;

(*(volatile unsigned long*)(0x50000000 + 0xcc)) = 0x06020602;

(*(volatile unsigned long*)(0x50000000 + 0xd0)) = 0x00060808;

(*(volatile unsigned long*)(0x50000000 + 0xd4)) = 0x060000c2;

(*(volatile unsigned long*)(0x50000000 + 0xd8)) = 0x00000e4a;

then , write or read with while (1)

so,

is there any problem during my config steps or anything wrong? or i missed setup anything?

what can i do anything else to check the problem point ,i have no idea to debug and so dispirited..... look forward to advises

thanks to everyone who gives me any suggestions,

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

The GPMC base address you have selected is 0x0A00 0000, with 32MB CS2 region size. You need to R/W to an address in this area to see CS2 toggle.

0 xiaowei yu over 9 years ago in reply to Biser Gatchev-XID

Prodigy 110 points

hi, Biser

yes ,as you said, i have write an address in this area in cs2.

while(1)
{
*((int *)0x0a000001) = 100;
}

but , can not catch signal at pin cs or we....

0 Biser Gatchev-XID over 9 years ago in reply to xiaowei yu

TI__Guru**** 393215 points

Why are you writing to an odd address when you have configured the GPMC in 16-bit mode?

0 xiaowei yu over 9 years ago in reply to Biser Gatchev-XID

Prodigy 110 points

i just want to see if the writing of gpmc can work , and think any address in cs2 area will be ok.

thanks you for the advice , i have a test by changing the writing address .
and i still consider that the address is not the point of this problem .

thanks very much for you reply

0 xiaowei yu over 9 years ago in reply to Biser Gatchev-XID

Prodigy 110 points

biser ,

the first important thing about the config of gpmc , please help me to check my steps whether right or not .

1, MMUInit (include cs2 memory region)

2, pinmuxconfig

3, enable clock to GPMC module

4,PinMuxConfig (select mode 0)

5,GPMCModuleSoftReset

6,config register 1 ~ 7

sorry for my poor english , hope you can follow what i want to say .
thank you

0 xiaowei yu over 9 years ago in reply to xiaowei yu

Prodigy 110 points

sorry , step 2 and 4 are repetition

0 Biser Gatchev-XID over 9 years ago in reply to xiaowei yu

TI__Guru**** 393215 points

Yes, these steps seem in the correct order. You can check section 7.1.4 from the AM335X TRM Rev. L for detailed description of GPMC initialization.

0 xiaowei yu over 9 years ago in reply to Biser Gatchev-XID

Prodigy 110 points

OK, thanks again for making sure the steps
i do the initialization following the TRM and have reference to somebody 's discuss in e2e.

everything seems to be right , but ..... pin dose not show any signals what are expected
and is there anything else i can try about debugging the problem ?