AM3352: How to use SPINLOCK Registers from SPL program.

Naoto Uegaki

Part Number: AM3352

I tried to use SPINLOCK registers from SPL program, but failed to use.
Could you please teach me how to use SPINLOCK registers correctly ?

Though I'm using SPL source code in the AM3352's latest SDK, SPINLOCK registers can't be displayed as shown in Fig.1.
And I tried to modify SPL source code to print SPINLOCK registers as follows.
int *rev_reg = (int*)(0x480ca000); // expected value is 0x50020000
printf("%08x\n", *rev_reg);
But, it jumped to exception handler when reading 0x480ca000.

Fig.1

over 4 years ago

0 Jianzhong Xu over 3 years ago

TI__Guru 58905 points

Hello,

Our SPL expert is out this week. We should be able to respond to your question early next week.

Thanks for your patience.

Jianzhong

+1 Hong Guan64 over 3 years ago in reply to Jianzhong Xu

TI__Guru 68420 points

Hello,
SPINLOCK module is under L4_PER interconnect.
Before accessing SPINLOCK module, the CLK needs to be enabled as listed below:
CM_PER_SPINLOCK_CLKCTRL @0x44E0010C = 0x2;

I'm attaching two screen-shots:
1. SPINLOCK CLK is disabled by default after POR => SPINLOCK module is NOT accessible
2. SPINLOCK CLK is enabled via JTAG => SPINLOCK module is accessible

Alternatively CLK is enabled @u-boot prompt:

=> md.l 0x44E0010C 1
44e0010c: 00030000                               ....
=> mw.l 0x44E0010C 0x2 1
=> md.l 0x44E0010C 1
44e0010c: 00000002                               ....
=> md.l 0x480ca000 1
480ca000: 50020000                               ...P

Best,

-Hong

am3_spinlock.pdf

0 Naoto Uegaki over 3 years ago in reply to Hong Guan64

Intellectual 775 points

Thank you for reply.
I confirmed to watch SPINLOCK register.

Processors

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AM3352: How to use SPINLOCK Registers from SPL program.