Part Number: AM2632
Hello, We have two questions about CPU clock.
1 Can we modify CPU clock frequency to 380M or 390M Hz in bootloader.
2 There is only one line code to set R5-0 core in bootloader code. You can see below picture at line 534. But our project used two cores. So I want to know where is the clock setting of R5-1 .
Hi Yao Wei,
Can we modify CPU clock frequency to 380M or 390M Hz in bootloader.
This would need modifications in the PLL settings, including the PLL lock frequency and is not very straight forward. By default, the PLL is locked at 2000MHz, and divided by 5 to obtain 400MHz. The following values need to be calculated and changed
as per this formula:
These settings are also explained in the section "Sequence to Configure the CORE PLL" in the Device TRM (AM263x Sitara
Microcontroller Technical Reference Manual (Rev. I))
There is only one line code to set R5-0 core in bootloader code. You can see below picture at line 534. But our project used two cores. So I want to know where is the clock setting of R5-1 .
This is part of "Bootloader_loadCpu(bootHandle, &bootImageInfo.cpuInfo[CSL_CORE_ID_R5FSS0_1]);"
Regards,
Sahana
Are these two clock frequency (380M or 390M) reasonable? Or could CPU run at these two frequency?
And if it will affect other peripheral device if we set CPU run these two frequency?
May I know the reason for this change?
This would also mean changing SYSCLK to CPU Frequency/2, so peripherals running on SYSCLK would be affected.
Another question is that our CPU are run at 200MHz frequency actually if our board is HS-SE device?
Because if (eFuseFreq == BOOTLOADER_R5SS_FREQ_200MHz) returns true.
This would be for devices with part number "AM263xxPxx..." devices. for example, "AM2632CPDFHMZCZRQ1" as in the datasheet:
Regards,
Sahana
