AM6442: Warm RST in SPL does not work with eMMC on custom board

Artur Toews

Part Number: AM6442
Other Parts Discussed in Thread: SK-AM64B

Hi,

our custom board does not load the SPL the second time.

Due to the ErrataID i2331 there is a fix in the SPL which does a warm RST when detecting a cold RST:

rst_src = readl(CTRLMMR_MCU_RST_SRC);
if (rst_src == COLD_BOOT || rst_src & (SW_POR_MCU | SW_POR_MAIN)) {
	printf("Resetting on cold boot to workaround ErrataID:i2331\n");
	do_reset(NULL, 0, 0, NULL);
}

We get the SPL promt:
U-Boot SPL 2021.01-00012-g51cf5d0f1c-dirty (Mar 14 2024 - 09:30:41 +0100)
Resetting on cold boot to workaround ErrataID:i2331
resetting ...

but then it doesn't get further.

This only happens when booting from eMMC. SD and USB boot works.

What is different between cold RST and warm RST?

We currently have problems with the speed of 200MHz, but I already added max-frequency = <100000000>; in the r5 devicetree.

Artur

over 1 year ago

+1 Hong Guan64 over 1 year ago

TI__Guru 68260 points

Please refer to the FAQ
e2e.ti.com/.../faq-am62x-how-to-check-and-configure-emmc-flash-rst_n-signal-to-support-warm_reset-from-emmc-booting-on-am62x-sk-e2
Best,
-Hong

0 Marc Schouteeten over 1 year ago

Prodigy 236 points

I'm having similar issues on a PROC100A board (SK-AM64B) using ti-processor-sdk-linux-am64xx-evm-09.02.00.08 SDK.

I rebuilt the u-boot-r5 and get the following on the console :

U-Boot SPL 2023.04-svn2 (Mar 20 2024 - 13:49:17 +0100)
EEPROM not available at 0x50, trying to read at 0x51
Resetting on cold boot to workaround ErrataID:i2331
Please resend tiboot3.bin in case of UART/DFU boot
resetting ...

(the eeprom was probably overwritten in earlier developments using this board)

When using the prebuilt image, I get the same result :

U-Boot SPL 2023.04-ga97ca328b3 (Jan 08 2024 - 08:11:13 +0000)
EEPROM not available at 0x50, trying to read at 0x51
Resetting on cold boot to workaround ErrataID:i2331
Please resend tiboot3.bin in case of UART/DFU boot
resetting ...

Is this related to eMMC boot issue mentioned above?

0 Hong Guan64 over 1 year ago in reply to Marc Schouteeten

TI__Guru 68260 points

The issue in the original e2e post was observed when booting from eMMC on the customer board. The original e2e submitter moved the original e2e post to "RESOLVED".

You mentioned you were booting on PROC100A board (SK-AM64B) where there's NO eMMC. So it is a different issue.
I'll recommend reposting your question to a new e2e post with all the details.
Best,
-Hong

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AM6442: Warm RST in SPL does not work with eMMC on custom board