Linux/AM3715: Cache enable prevents image download via JTAG

ranchu

Guru 20755 points

Part Number: AM3715

Tool/software: Linux

Hello,

I have problem loading application to memory with jtag if I use cache in a standalone application.

After MLO or u-boot done, I can load/unload application without any issues.

But If I than enable cache in the standalone application (the routine is below). then I can't any more load into memory with the jtag.

Is there any possible explanation for this ?

;********************************************************************************************************
; BSP_CachesEn()
;
; Description : Enable L1 Data and Instruction cache as well as the L2 unified cache.
;
; Prototypes : void BSP_L2C310Config (void)
;
; Argument(s) : None
;********************************************************************************************************

EXPORT BSP_CachesEn

BSP_CachesEn

MRC p15, 0, r0, c1, c0, 0
ORR r0, r0, #CTRL_C1_C
ORR r0, r0, #CTRL_C1_I
MCR p15, 0, r0, c1, c0, 0
DSB
ISB

DSB

BX lr

Regards,

Ran

over 8 years ago

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi,

Which linux SDK is this?

Best Regards,
Yordan

0 Steve Kipisz over 8 years ago in reply to Yordan Kovachev

TI__Genius 15510 points

Which version of u-boot?

Steve K.

0 ranchu over 8 years ago in reply to Steve Kipisz

Guru 20755 points

Hello,

I am using u-boot 2009.11.psp03.00.01.06.sdk and x-loader 1.46.psp03

I think that maybe the enable cache routine which I do in the standalone appkication (which runs after xloader or after uboot) does something differently than the usual cache enable in xloader or uboot?

But I dont understand yet what it does that prevent loading another application with debugger (attaching works ok - only downloading and start new application doesn't).

Thank you
Ran

0 ranchu over 8 years ago in reply to ranchu

Guru 20755 points

Can anyone check ?

0 Steve Kipisz over 8 years ago in reply to ranchu

TI__Genius 15510 points

Can you try an experiment? Can you add

#define CONFIG_SYS_DCACHE_OFF

to your .h file?

Steve K.

0 ranchu over 8 years ago in reply to Steve Kipisz

Guru 20755 points

Hello Steve,

I am using a standalone application.
I just need to understand the reason behind this behaviour.
I see that with the above assembly initalization code (used in the standalone application) it always prevents the download &start to operate,
but if I skip that function then I can download and debug.

So if u-boot also enable d-cache, so it is probably not a d-cache issue, maybe instruction cache (which is probably not used in u-boot and used in this assembly code) ?

Thank you,
Ran

0 ranchu over 8 years ago in reply to ranchu

Guru 20755 points

Hello Steve ,

Is it not possible to do download when d-cache (or i-cache) is enabled ?

Regards,

Ran

0 ranchu over 8 years ago in reply to ranchu

Guru 20755 points

I mean download, not debug

Processors

Processors forum

Linux/AM3715: Cache enable prevents image download via JTAG