Hi,
I am planning to place the AM35XX in our design.
I needed some infomation in regards to Boot up time as thats one of our requirement.
The set up:
I am not using the UART or USB boot options
I need the CPU to boot up from the external NAND flash (GPMC) in normal operation.
However while in the production area, I need to get the CPU to boot up from the MMC card ( pre flashing). Once the NAND flash is programmed with User Image., I plan to remove the MMC card, and on the next PoR it needs to boot directly from Fash.
After having gone through the Tech Ref Manual (TRM), I conculed that the Boot Config Pins after PoR can be
-a) 0b01111 NAND USB UART MMC1 (Table 24-3. Memory Booting Configuration Pins after POR),Booting Sequence When SYS.BOOT[5] = 0
-b) 0b01111 USB UART MMC1 NAND (Table 24-4. Peripheral Booting Configuration Pins after POR),Booting Sequence When SYS.BOOT[5] = 1
Q1) If I choose Option a), During production time, How does the boot up sequence behave when it sees a External NAND Flash but no Valid Image in it?
Q2) How does the ARM's ROM code, understand that there isnt a valid image in the Blank flash?
Q3) If I do choose Option b), How long time would elapse before it timesout on the USB and UART polling? would it take more than a 1 sec?
Would be great if someone could throw some light on this!
Thank you,
Pretesh
