DataAbort on attempt to access GPMC Registers

Mark Steinmetz

I am attempting to initialize the GPMC and am obviously missing something because a DataAbort is generated when I attempt to read the GPMC REVISION REGISTER. the CM_PER_L3S_CLKSTCTRL register contains a 0xa -- so it appears the L3S clock is active. I have also confirmed that the CM_PER_GPMC_CLKCTRL register is 0x2. Based on the values of the two registers I believe I am supplying a valid clock to the GPMC. Any insight on what I am missing would be greatly appreciated.

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Mark,

What processor and software are you using?

0 Mark Steinmetz over 10 years ago in reply to Biser Gatchev-XID

Intellectual 300 points

I am using the AM3356ZCZ, and am using the TI Code Composer Studio V6.

0 Biser Gatchev-XID over 10 years ago in reply to Mark Steinmetz

TI__Guru**** 393215 points

If you are going for bare-metal programming I can suggest that you base your software on the Starterware package: http://software-dl.ti.com/dsps/dsps_public_sw/am_bu/starterware/latest/index_FDS.html The Starterware bootloader does most of the necessary processor initialization. There is also a dedicated Starterware forum: http://e2e.ti.com/support/embedded/f/790.aspx

0 Mark Steinmetz over 10 years ago in reply to Biser Gatchev-XID

Intellectual 300 points

Problem ANSWERED!

Thanks Biser, the lightbulb went off when I was looking at the Starterware package you suggested. My problem was that another engineer had failed to add the GPMC address space to the MMU entry table and hence attempts to access the address space was then causing the DataAbort. Once the GPMC address space was added to the table everything worked as expected.

I appreciate your guidance/support!

Mark

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DataAbort on attempt to access GPMC Registers