jlaitine opened a new pull request, #19020:
URL: https://github.com/apache/nuttx/pull/19020
## Summary
This is a small size optimization for the mmcsd_sdio driver.
When the CONFIG_MMCSD_MMCSUPPORT is disabled, we can remove the mmc
partition support, saving ~300+ bytes of flash on a 32-bit Arm target. These
partitions don't exist on SD cards.
## Impact
No functional impact, removes "mmcsd_switch" support from SD cards. This
function only implements the CMD6 MMC switch, not SD "switch function", so it
is safe to remove on systems without MMC.
## Testing
Building for stm32f746-ws:nsh
```
Before change:
LD: nuttx
Memory region Used Size Region Size %age Used
itcm: 0 GB 1 MB 0.00%
flash: 233696 B 1 MB 22.29%
dtcm: 0 GB 64 KB 0.00%
sram1: 15280 B 240 KB 6.22%
sram2: 0 GB 16 KB 0.00%
After change:
LD: nuttx
Memory region Used Size Region Size %age Used
itcm: 0 GB 1 MB 0.00%
flash: 233376 B 1 MB 22.26%
dtcm: 0 GB 64 KB 0.00%
sram1: 15280 B 240 KB 6.22%
sram2: 0 GB 16 KB 0.00%
```
Diff is 320 bytes smaller.
Testing of stm32f7 (sd card mounted on /fs/microsd):
```
nsh> cd /fs/microsd
nsh> echo "Hello World" > test.txt
nsh> cat test.txt
Hello World
nsh>
< reboot >
nsh> cd /fs/microsd
nsh> cat test.txt
Hello World
nsh>
```
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