Compiler/PROCESSOR-SDK-DRA8X-TDA4X: SBL boot Liunx/QNX

user5354548

Part Number: PROCESSOR-SDK-DRA8X-TDA4X

Tool/software: TI C/C++ Compiler

In the TDA4X PSDKRA, MCUSW package has a example of CAN Response and Bootloader Demo Application. In the boot section, there is a flowchart as follow:

According to my understanding， we can boot linux/qnx with SBL, but I can't mount my rootfs.

Please append a correct "root=" boot option

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

I have two questions：

1. Whether we can use SBL to start linux / qnx. If this method is feasible, we need to mount our rootfs.

2 . In the 8.2. Understanding bootloaders in J7 Processor SDK Automotive (RTOS/Linux), Have the following description:

Does this mean that there is no way to use SBL to start Linux / qnx. If we want to start Linux / qnx, we must use SPL. Does TI recommend the corresponding solution?

Hope to get your reply.

Thanks.

over 5 years ago

0 Keerthy J over 5 years ago

TI__Guru**** 169090 points

Hi,

Please find my answers:

1) We need to provide the bootargs which point to the right file system. So you can point to
file system on your SD card with the below patch.

diff --git a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
index 0bc4805ecfb2..788dee66dd22 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
@@ -15,7 +15,8 @@
/ {
chosen {
stdout-path = "serial2:115200n8";
- bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000";
+ /* bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000"; */
+ bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000 root=/dev/mmcblk1p2 rw rootfstype=ext4 rootwait";
};

2) Refer:
http://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/latest/exports/docs/mcusw/mcal_drv/docs/drv_docs/demo_boot_app_mcu_rtos_top.html

If you use that then: SBL + Boot application can be used to boot Linux/Qnx.

Regards,
Keerthy

0 user5354548 over 5 years ago in reply to Keerthy J

Prodigy 200 points

Thank you very much. I will try it.

Processors

Processors forum

Compiler/PROCESSOR-SDK-DRA8X-TDA4X: SBL boot Liunx/QNX