samples/littlefs: Fix rcar boards selecting Flash API

[de-nordic]

The rcar boards use block variant of LittleFS and Disk Access API, but have been using proj.conf for Flash API based access. The commit adds section building boards with pro_blk.conf into sample.yaml, where rcar boards will now be allowed, and removes redundant configuration lines from board specific conf files.

[xakep-amatop]

with these changes sample doesn't work:

Starting kernel ...                                                                                                                                                                                                                                                                                                                                                                          
                                                                                                                                                                                                                                                                                                                                                                                             
I: mmc@ee140000: initialize driver, MMC version 0x10                                                                                                                                                                                                                                                                                                                                         
*** Booting Zephyr OS build v3.6.0-3798-g39b873223877 ***                                                                                                                                                                                                                                                                                                                                    
Sample program to r/w files on littlefs                                                                                                                                                                                                                                                                                                                                                      
I: LittleFS version 2.8, disk version 2.1                                                                                                                                                                                                                                                                                                                                                    
E: Storage init ERROR!                                                                                                                                                                                                                                                                                                                                                                       
E: fs mount error (-22)

results without your commit:

Starting kernel ...

I: mmc@ee140000: initialize driver, MMC version 0x10
*** Booting Zephyr OS build v3.6.0-3797-gff58bd02047c ***
Sample program to r/w files on littlefs
I: LittleFS version 2.8, disk version 2.1
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Legacy card detected, no CMD8 support
I: Card does not support CMD8, assuming legacy card
I: Card switched to 1.8V signaling
I: CID decoding not supported for MMC
I: Card block count is 249954304, block size is 512
E: mmc@ee140000: interrupt signal timeout error -11
I: FS at MMC: is 249954304 0x200-byte blocks with 512 cycle
I: sizes: rd 512 ; pr 512 ; ca 512 ; la 2048
/MMC:: bsize = 512 ; frsize = 512 ; blocks = 249954304 ; bfree = 249954300

Listing dir /MMC: ...
[FILE] boot_count (size = 1)
[FILE] pattern.bin (size = 547)
/MMC:/boot_count read count:1 (bytes: 1)
/MMC:/boot_count write new boot count 2: [wr:1]
------ FILE: /MMC:/pattern.bin ------
02 55 55 55 55 55 55 55 03 55 55 55 55 55 55 55
04 55 55 55 55 55 55 55 05 55 55 55 55 55 55 55
06 55 55 55 55 55 55 55 07 55 55 55 55 55 55 55
08 55 55 55 55 55 55 55 09 55 55 55 55 55 55 55
0a 55 55 55 55 55 55 55 0b 55 55 55 55 55 55 55
0c 55 55 55 55 55 55 55 0d 55 55 55 55 55 55 55
0e 55 55 55 55 55 55 55 0f 55 55 55 55 55 55 55
10 55 55 55 55 55 55 55 11 55 55 55 55 55 55 55
12 55 55 55 55 55 55 55 13 55 55 55 55 55 55 55
14 55 55 55 55 55 55 55 15 55 55 55 55 55 55 55
16 55 55 55 55 55 55 55 17 55 55 55 55 55 55 55
18 55 55 55 55 55 55 55 19 55 55 55 55 55 55 55
1a 55 55 55 55 55 55 55 1b 55 55 55 55 55 55 55
1c 55 55 55 55 55 55 55 1d 55 55 55 55 55 55 55
1e 55 55 55 55 55 55 55 1f 55 55 55 55 55 55 55
20 55 55 55 55 55 55 55 21 55 55 55 55 55 55 55
22 55 55 55 55 55 55 55 23 55 55 55 55 55 55 55
24 55 55 55 55 55 55 55 25 55 55 55 55 55 55 55
26 55 55 55 55 55 55 55 27 55 55 55 55 55 55 55
28 55 55 55 55 55 55 55 29 55 55 55 55 55 55 55
2a 55 55 55 55 55 55 55 2b 55 55 55 55 55 55 55
2c 55 55 55 55 55 55 55 2d 55 55 55 55 55 55 55
2e 55 55 55 55 55 55 55 2f 55 55 55 55 55 55 55
30 55 55 55 55 55 55 55 31 55 55 55 55 55 55 55
32 55 55 55 55 55 55 55 33 55 55 55 55 55 55 55
34 55 55 55 55 55 55 55 35 55 55 55 55 55 55 55
36 55 55 55 55 55 55 55 37 55 55 55 55 55 55 55
38 55 55 55 55 55 55 55 39 55 55 55 55 55 55 55
3a 55 55 55 55 55 55 55 3b 55 55 55 55 55 55 55
3c 55 55 55 55 55 55 55 3d 55 55 55 55 55 55 55
3e 55 55 55 55 55 55 55 3f 55 55 55 55 55 55 55
40 55 55 55 55 55 55 55 41 55 55 55 55 55 55 55

42 55 55 55 55 55 55 55 43 55 55 55 55 55 55 55
44 55 55 55 55 55 55 55 45 55 55 55 55 55 55 55
46 55 ab 
I: /MMC: unmounted
/MMC: unmount: 0

maybe I've used wrong command for building, here what I've used:

west build -p always -b rcar_h3ulcb/r8a77951/a57 samples/subsys/fs/littlefs -- -DCONF_FILE=prj_blk.conf

[xakep-amatop]

after these changes we use CONFIG_DISK_DRIVER_SDMMC + CONFIG_DISK_DRIVER_MMC (enabled by disk mmc node) and this produces issue

I: LittleFS version 2.8, disk version 2.1
E: Storage init ERROR!
E: fs mount error (-22)

[xakep-amatop]

these configs aren't applied at all with build command:

west build -p always -b rcar_h3ulcb/r8a77951/a57 samples/subsys/fs/littlefs -- -DCONF_FILE=prj_blk.conf

[xakep-amatop]

Review finished.

[de-nordic]

Review finished.

I have reworked configurations for your boards. Now they also enabled MMC and disable SDMCC Disk Access Drivers, the diff now, for , looks like this:

[xakep-amatop]

Checked changes, everything works nicely.