Hi all,
Im working on Keystone II Tci6638k2k(4arm+8dsp) custom design board with u-boot. I understand that how u-boot working.
U-boot gives entry point to other cores. Other cores take program counters with this way. But i want to give core registers too. Is it possible? Can primary arm access secondary arm's registers?
Best Regards.
Srt
Hello,
you can independently set the register values for each core by using CPU ID register.
For example, the following code will can be used.
MRC p15,0,r0,c0,c0,5 @ returns CPU ID register and r0,r0,#0x3 cmp r0,#0 beq core0_set cmp r0,#1 beq core1_set cmp r0,#2 beq cpre2_set cmp r0,,#2 beq core3_set .......... core0_set: <set core0 registers> core1_set: <set core1 registers> core2_set: <set core2 registers> core3_set: <set core3 registers>
Isn't this your intention?
Best regards,
Yasuhiko Koumoto.
Hi,
in the code you are providing you are able to have different core register setting depending on the core ID. But initial question was a way to set core 1 register from core 2. And that is not possible using any kind of instruction. The only way is to have :
- core 1 setting Core 2 register value in memory
- core 2 is having dedicated software in charge of reading this memory to get value and set its own register.
Br
Sebastien
Hello Sebastien,
thank you for correcting me. I had misunderstood.
I think your method would be the most appropriate.
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