Part Number: AM4376
Hi TI Team,
We are using the component AM4376, and the follow question block our testing and project, could you please help to take a look at it, thank you.
Demo the default startup is MMC0 (Micro SD) and our project requirements are started from FLASH. We burned the version to Flash according to SDK Guide, but can't startup.
BR,
Bijian Chen
I did same on AM4378-SK board with Linux SDK11.2 and 6.3, also can't boot from QSPI nor flash
#1. Build u-boot.bin with am43xx_evm_qspiboot_defconfig
#2. flash QSPI flash according to user guide: https://software-dl.ti.com/processor-sdk-linux/esd/AM437X/11_02_05_02/exports/docs/linux/Foundational_Components/U-Boot/UG-QSPI.html
=> mmc rescan
=>
=> fatload mmc 0 ${loadaddr} u-boot.bin
759824 bytes read in 43 ms (16.9 MiB/s)
=> sf probe 0
SF: Detected mx66l51235l with page size 256 Bytes, erase size 64 KiB, total 64 MiB
=> sf erase 0x0 0x100000
SF: 1048576 bytes @ 0x0 Erased: OK
=> sf write ${loadaddr} 0x0 ${filesize}
device 0 offset 0x0, size 0xb9810
SF: 759824 bytes @ 0x0 Written: OK
=>
#3. power off board, remove SD card, power up again, no output from UART.
#4. Checked bootmode has QSPI in list.
root@am437x-evm:~# devmem2 0x44e10040
/dev/mem opened.
Memory mapped at address 0xb6f6e000.
Read at address 0x44E10040 (0xb6f6e040): 0x02400338
#5. From user guide uboot section, QSPI boot only supported by IDK board, is there a reason?
Hi Tony,
Thank you very much for the conducted tests on the two EVMs and your inputs here.
I checked that both EVMs contain the same QSPI MACRONIX MX66L51235FMI NOR flash memories.
From the attached MLO + U-Boot build table I understand that there is no default TI configuration to build MLO + U-Boot image that can be booted over QSPI from AM437x ROM code on the AM437x Starter Kit. There is only defconfig file to build QSPI bootable MLO/U-Boot ONLY for the AM437x Industrial kit.
Your tested SYSBOOT[4:0] configuration is:
Here are some notes I made from the AM437x TRM based on your full SYSBOOT configuration:
"Read at address 0x44E10040 (0xb6f6e040): 0x02400338" -> this value converted to binary is:
0b0000 0010 0100 0000 0000 0011 0011 1000
[4:0] = 0b11000 -> boot list sequence: MMC0->USB1->USB0->QSPI (Q: How fast is device scanning performed until QSPI reached ?)
[5] = 0b1 - don't care
[7:6] = 0b00 - quad read (boot) from the Flash (mis-aligned with the STS bitfield description ) + pinmux option 0
Comment: So I understand that the quad read QE bit of MX66L51235FMI must be initially programmed to 0b1 to allow ROM to boot in Quad mode.
Is that the case on your Starter Kit ?
[10:8] = 0b011 - GP device
[15:11]=0b00000 - kept at reset value 0h
[16] = 0b0 - 8-bit GPMC data bus
[17] = 0b0 - ignore WAIT input
[19:18] = 0b00 - No GPMC address/data muxing
[21:20] = 0b00 - Reserved
[23:22] = 0b01 - 24MHz- system clock selected
[24] SYSBOOT16 = 0b0 -> USB0(USB_CL)/USB1(USB_MS) DP/DM not swapped
[25] SYSBOOT17 = 0b1->CLKOUT1 signal selected on pin: xdma_event_intr0
[26] SYSBOOT18 = 0b0 ->Do not route EXTCLK to CLKOUT2
BTW. Need to wait 29s to get UBOOT log output after plug in power.
Have you checked if with the below configuration of the SYSBOOT[4:0], U-boot can be booted faster ?
Let me check with our AM437x EVM / U-Boot software experts and follow-up.
Bijan Chen,
Would you please elaborate answering my initial questions.
Thanks
Best Regards
Anastas Yordanov
Compared SK and IDK schematic, QSPI flash reset pin is not connected on SK board, while it is connected to system_reset on IDK board. short R12 and U5 Pin3 on SK board, can also boot up from QSPI flash.
Keep in mind: also need to wait 29s for the first log output from UART.
