How do I use STM32CubeProgrammer to boot from RAM with no media ?

[sja]

We have a STM32MP1 system with no flash media.

How do I push a TF-A/uboot image to DRAM and boot/run from DRAM with

no MMC/flash media ?

[sja]

Figured this out ... simple two line tsv file:

#Opt   Id   Name   Type   IP   Offset   Binary

-   0x01   fsbl1-boot   Binary   none   0x0   tf-a-stm32mp157c-ya157c-4e512d-trusted.stm32

-   0x03   ssbl-boot   Binary   none   0x0   u-boot-stm32mp157c-ya157c-4e512d-trusted.stm32

But now how do I also push kernel image and dtb over USB so uboot can boot the kernel.

I tried this but programmer gave a syntax error:

#Opt   Id   Name   Type   IP   Offset   Binary

-   0x01   fsbl1-boot   Binary   none   0x0   tf-a-stm32mp157c-ya157c-4e512d-trusted.stm32

-   0x03   ssbl-boot   Binary   none   0x0   u-boot-stm32mp157c-ya157c-4e512d-trusted.stm32

-   0x03   kernel      Binary   none   0xC2000000   uImage

-   0x03   dtb      Binary   none   0xC4000000   stm32mp157c.dtb

[PatrickF]

Hi,

I fear it is not possible to start Linux directly using CubeProgrammer, which is intended to program Flash.

Once you have taken the uBoot prompt, maybe look and https://wiki.st.com/stm32mpu/wiki/How_to_boot_the_kernel_via_TFTP_from_U-Boot

and https://wiki.st.com/stm32mpu/wiki/USB_overview#How_to_configure_USB_Gadget_through_configfs which might be used to have an Ethernet over USB if needed.

[PatrickD]

Not possible today but it is planned and coming soon: add a ram0 target.

A other solution it is change the bootcmd to execute a the U-Boot dfu command with ram target when the board is booting from usb and only use STM32CubeProgrammer to load U-boot in DDR, then using dfu-utils to load kernel in DDR.

something like

1/ define dfu ram target with U-Boot variable:

dfu_alt_info=uImage ram ${kernel_addr} 0x2000000;devicetree.dtb ram $[fdt_addr_r} 0x1000000;

2/ update U-boot command

#define STM32MP_BOOTCMD "bootcmd_stm32mp=" \

"echo \"Boot over ${boot_device}${boot_instance}!\";" \

"if test ${boot_device} = serial || test ${boot_device} = usb;" \

- "then stm32prog ${boot_device} ${boot_instance}; " \

+ "then dfu 0 ram 0; bootm ${kernel_addr} ${devicetree_addr};" \

"else " \

"run env_check;" \

"if test ${boot_device} = mmc;" \

"then env set boot_targets \"mmc${boot_instance}\"; fi;" \

"if test ${boot_device} = nand ||" \

 " test ${boot_device} = spi-nand ;" \

"then env set boot_targets ubifs0; fi;" \

"run distro_bootcmd;" \

"fi;\0"

not tested, perhaps need some tuning.

regards

[PDELA.1]

Hi,

with OpenSTLinux V2.0.0, it is now possible to load and execute a Linux kernel in RAM with STM32CubeProgrammer

https://wiki.st.com/stm32mpu/wiki/STM32CubeProgrammer_flashlayout#FlashLayout_file_to_load_and_start_kernel

#Opt Id Name Type IP Offset Binary

- 0x01 fsbl Binary none 0x0 tf-a.stm32

- 0x03 ssbl Binary none 0x0 u-boot.stm32

P 0x10 kernel System ram0 0xC2000000 uImage.bin

P 0x11 dtb FileSytem ram0 0xC4000000 stm32mp157c.dtb

Regards