BeagleBone Black: U-Boot : NAND 0 MiB

dzhou · June 25, 2020, 8:38pm

Hi,

I booted BeagleBon Black, through UART, using two stages files. UBoot starts but it doesn’t recognize the NAND with error :
Error: “bootcmd_nand0” not defined

UBoot Version: U-Boot 2020.07-rc4-00039-g4ff63383e3 (Jun 25 2020 - 15:55:00 -0400)

Is Env not setup to the UBoot?

Thank You,

David

RobertCNelson · June 25, 2020, 8:41pm

@dzhou, the am335x_evm target in u-boot supports many am335x based boards… One of which has NAND… The BeagleBone Black does not…

Here is usually where i rip it out:

github.com

RobertCNelson/Bootloader-Builder/blob/master/patches/v2019.04/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch#L521-L527


-CONFIG_CMD_SPL_NAND_OFS=0x00080000
 # CONFIG_CMD_FLASH is not set
-CONFIG_CMD_NAND=y
-# CONFIG_CMD_SETEXPR is not set
-CONFIG_CMD_MTDPARTS=y
-CONFIG_MTDIDS_DEFAULT="nand0=nand.0"
-CONFIG_MTDPARTS_DEFAULT="mtdparts=nand.0:128k(NAND.SPL),128k(NAND.SPL.backup1),128k(NAND.SPL.backup2),128k(NAND.SPL.backup3),256k(NAND.u-boot-spl-os),1m(NAND.u-boot),128k(NAND.u-boot-env),128k(NAND.u-boot-env.backup1),8m(NAND.kernel),-(NAND.file-system)"

Regards,

dzhou · June 25, 2020, 8:44pm

Hi Robert,

BeagleBone Black Rev A or C has eMMC. What is the type of eMMC? Not NAND? The dev board I have
1GHz AM3359 Sitara ARM Cortex
board_rev=BWA5

How to access eMMC from UBoot, then?

Thank you,
David

dzhou · June 25, 2020, 8:46pm

Robert,

Thank you,

David

RobertCNelson · June 25, 2020, 8:46pm

@dzhou, eMMC is not NAND…

eMMC was designed to be placed on PCB’s like NAND, but with ease of use like microSD’s…

The e in eMMC actually stands for “embedded” MMC…

With NAND, “YOU” provide the raw file system, and control individual sectors. With eMMC/microSD, you just install a file system, and the build-in controller takes care of everything…

Regards,