Re: [U-Boot-Users] Flash Replacement for AT91RM9200-EK
Generally, the processor will use the slowest access time to fetch the boot code when it come out of the reset state. So, are you sure the default MCLK is 60MHz/4? You look up the datasheet about What is the defaut MCLK's freq? of cause, you can measure it directly.
-Dave
Hello Dave, i am not shure, what the exact clocking rate is. All i know is, that there is a "slow clock" at 32768Hz and a "fast clock" at 18.432MHz connected. The first Opcode fetches after Reset seem to be clocked with the "slow clock" and now the Initialization by U-Boot sets up the timing of the EBI - but what timing is selected for the parallel Flash ?
THX Thomas
Generally, the processor will use the slowest access time
to fetch the
boot code when it come out of the reset state. So, are you sure the default MCLK is 60MHz/4? You look up the datasheet about What is the defaut MCLK's freq? of cause, you can measure it directly.
-Dave
Hello Dave, i am not shure, what the exact clocking rate is. All i know is, that there is a "slow clock" at 32768Hz and a "fast clock" at 18.432MHz connected. The first Opcode fetches after Reset seem to be clocked with the "slow clock" and now the Initialization by U-Boot sets up the timing of the EBI - but what timing is selected for the parallel Flash ?
THX Thomas
Please see the source code. It should be at <board>.h.
-Dave
participants (2)
-
Erdmann, Thomas -
Liu Dave-r63238