MMC Device 0 not found

[alenik-mm]

Hello,

I have a custom board with an eMMC on it and with no SD card available. In the U-Boot device tree I have the following line (On sdmmc2 is my eMMC):

aliases{
	mmc0 = &sdmmc2;
};

The U-Boot seems to partly have a problem with it.

• Commands like "mmc write" or "mmc info" use the MMC Interface 0 - they set "curr_device" to 0 by default (unless I use "mmc dev 1"). And this is not a problem.
• However, the MMC environment works with MMC interface 1, which leads to failures. What I find the most weird is the following function in the mmc.c file:

static int env_mmc_save(void)
{
	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
	int dev = mmc_get_env_dev();
        ...
}

The variable dev in the line 4 is always 1, I guess since the eMMC is set as boot instance 1.

To sum up: The MMC functions work by default with mmc 0, the env MMC works by defalt with mmc 1.

PS: I could maybe use the MMC 1 and use the 'mmc dev 1' at the beginning, but the STMCubeProgrammer cannot flash the devce as it comes with an error:

Download in Progress:
[==================================================] 100% 
 
File download complete
Time elapsed during download operation: 00:01:40.159
 
RUNNING Program ... 
  PartID:      :0x03 
Start operation done successfully at partition 0x03
GETPHASE command not acknowledged!
 
Reemission of GetPhase command
 
 
Error: GetPhase Error: mmc device 1 not found
Received PhaseID == 0xFF, system is going to reboot

Could someone help me on this?

[Olivier GALLIEN · Accepted solution]

Hi @Community member​ ,

I noticed you also raised same question to OLS.

We are working on a clean solution.

In the meantime we suggest to modify U-boot as follow :

int mmc_get_env_dev(void)

{

return 0;

}

Hope it help

Olivier

[alenik-mm]

Hi Olivier,

that also works for me. Thanks!

Aleksandar

[allard]

I'm running into the same problem, is there an option besides editing files? If not, how to edit the file above with the distribution package, by creating a patch file?

[Olivier GALLIEN]

Hi @allard​ 

I consider more convenient to work in developer package during bring-up BSP setting phase.

But you can stick on Distribution and see this page for support :

https://wiki.st.com/stm32mpu/wiki/How_to_cross-compile_with_the_Distribution_Package#Modifying_the_U-Boot

Olivier