drivers/mtd: Optimization of mtdconfig module #18024

zhaoxingyu12 · 2026-01-19T17:59:22Z

Note: Please adhere to Contributing Guidelines.

Summary

Optimize mtdconfig related modules

change filename mtd_config_fs to mtd_config_nvs
change kconfig MTD_CONFIG_FAIL_SAFE to MTD_CONFIG_NVS
other changes related to the name MTD_CONFIG_FAIL_SAFE
Some optimizations have been made to NVS, including adding data CRC verification, clearing dirty data during GC, and fixing several Tasking compiler errors.

Impact

KV read and write functions

Testing

testcases
`
int print_list(void)
{
int fd = open("/dev/nvs", O_RDONLY);

uint8_t buf[255];
struct config_data_s data;
int ret;

data.configdata = buf;
data.len = 255;
ret = ioctl(fd, CFGDIOC_FIRSTCONFIG, &data);
if (ret < 0)
    return ret;

#ifdef CONFIG_MTD_CONFIG_NAMED
syslog(0, "######## key=%s, value=%s", data.name, data.configdata);
#else
syslog(0, "######## id=%d, instance=%d, value=%s", data.id, data.instance, data.configdata);
#endif

while (1) {
    data.configdata = buf;
    data.len = 255;
    ret = ioctl(fd, CFGDIOC_NEXTCONFIG, &data);
    if (ret < 0) {
        ret = -errno;

        /* ENOENT is expected when there are no more entries */

        if (ret == -ENOENT)
            ret = 0;

        break;
    }

#ifdef CONFIG_MTD_CONFIG_NAMED
syslog(0, "######## key=%s, value=%s", data.name, data.configdata);
#else
syslog(0, "######## id=%d, instance=%d, value=%s", data.id, data.instance, data.configdata);
#endif
}

close(fd);
return ret;

}

void test(void)
{
uint64_t filling_id = 0;
struct config_data_s data;
int ret;

int fd = open("/dev/nvs", O_RDWR);
while (1)
  {
  
  uint8_t wr_buf[50] = {0};
  uint8_t wr_buf1[50] = {0};
  snprintf(wr_buf, sizeof(wr_buf), "v----------------------------%llx", filling_id);

#ifdef CONFIG_MTD_CONFIG_NAMED
char rd_buf[10] = {0};

  snprintf(rd_buf, sizeof(rd_buf), "k%llx", filling_id);  
  strlcpy(data.name, rd_buf, sizeof(data.name));

#else
data.id = (uint16_t)filling_id;
data.instance = (int)filling_id + 1;
#endif
data.configdata = wr_buf;
data.len = sizeof(wr_buf);
ret = ioctl(fd, CFGDIOC_SETCONFIG, &data);

   if (ret != 0)
     {
       return;
     }

  data.configdata = wr_buf1;
  ret = ioctl(fd, CFGDIOC_GETCONFIG, &data);

   if (ret < 0)
     {
       assert(0);
     }

   if (memcmp(wr_buf, wr_buf1, sizeof(wr_buf)) != 0)
     {
       assert(0);
     }

   filling_id++;
  }
close(fd);

}

int main(int argc, FAR char *argv[])
{
test();
print_list();
return 0;
}
`

test result
[ 3.724800] [core0] ######## key=k28, value=v----------------------------28
[ 3.725400] [core0] ######## key=k27, value=v----------------------------27
[ 3.726000] [core0] ######## key=k26, value=v----------------------------26
[ 3.726600] [core0] ######## key=k25, value=v----------------------------25
[ 3.727100] [core0] ######## key=k24, value=v----------------------------24
[ 3.727700] [core0] ######## key=k23, value=v----------------------------23
[ 3.728300] [core0] ######## key=k22, value=v----------------------------22
[ 3.728800] [core0] ######## key=k21, value=v----------------------------21
[ 3.729400] [core0] ######## key=k20, value=v----------------------------20
[ 3.729900] [core0] ######## key=k1f, value=v----------------------------1f
[ 3.730500] [core0] ######## key=k1e, value=v----------------------------1e
[ 3.731200] [core0] ######## key=k1d, value=v----------------------------1d
[ 3.731800] [core0] ######## key=k1c, value=v----------------------------1c
[ 3.732500] [core0] ######## key=k1b, value=v----------------------------1b
[ 3.733100] [core0] ######## key=k1a, value=v----------------------------1a
[ 3.733700] [core0] ######## key=k19, value=v----------------------------19
[ 3.734300] [core0] ######## key=k18, value=v----------------------------18
[ 3.734800] [core0] ######## key=k17, value=v----------------------------17
[ 3.735400] [core0] ######## key=k16, value=v----------------------------16
[ 3.736100] [core0] ######## key=k15, value=v----------------------------15
[ 3.736700] [core0] ######## key=k14, value=v----------------------------14
[ 3.737300] [core0] ######## key=k13, value=v----------------------------13
[ 3.737700] [core0] ######## key=k12, value=v----------------------------12
[ 3.738200] [core0] ######## key=k11, value=v----------------------------11
[ 3.738700] [core0] ######## key=k10, value=v----------------------------10
[ 3.739100] [core0] ######## key=kf, value=v----------------------------f
[ 3.739600] [core0] ######## key=ke, value=v----------------------------e
[ 3.740100] [core0] ######## key=kd, value=v----------------------------d
[ 3.740600] [core0] ######## key=kc, value=v----------------------------c
[ 3.741100] [core0] ######## key=kb, value=v----------------------------b
[ 3.741700] [core0] ######## key=ka, value=v----------------------------a
[ 3.742100] [core0] ######## key=k9, value=v----------------------------9
[ 3.742600] [core0] ######## key=k8, value=v----------------------------8
[ 3.743100] [core0] ######## key=k7, value=v----------------------------7
[ 3.743500] [core0] ######## key=k6, value=v----------------------------6
[ 3.744000] [core0] ######## key=k5, value=v----------------------------5
[ 3.744500] [core0] ######## key=k4, value=v----------------------------4
[ 3.744900] [core0] ######## key=k3, value=v----------------------------3
[ 3.745400] [core0] ######## key=k2, value=v----------------------------2
[ 3.746000] [core0] ######## key=k1, value=v----------------------------1
[ 3.747300] [core0] ######## key=k0, value=v----------------------------0
[ 3.748300] [core0] ######## key=k29, value=v----------------------------29
[ 3.748700] [core0] ######## key=k2a, value=v----------------------------2a
[ 3.749300] [core0] ######## key=k2b, value=v----------------------------2b
[ 3.749800] [core0] ######## key=k2c, value=v----------------------------2c
[ 3.750300] [core0] ######## key=k2d, value=v----------------------------2d
[ 3.751000] [core0] ######## key=k2e, value=v----------------------------2e
[ 3.751600] [core0] ######## key=k2f, value=v----------------------------2f
[ 3.752200] [core0] ######## key=k30, value=v----------------------------30
[ 3.752700] [core0] ######## key=k31, value=v----------------------------31
[ 3.753300] [core0] ######## key=k32, value=v----------------------------32
[ 3.753800] [core0] ######## key=k33, value=v----------------------------33
[ 3.754300] [core0] ######## key=k34, value=v----------------------------34
[ 3.754900] [core0] ######## key=k35, value=v----------------------------35
[ 3.755400] [core0] ######## key=k36, value=v----------------------------36
[ 3.756100] [core0] ######## key=k37, value=v----------------------------37
[ 3.756600] [core0] ######## key=k38, value=v----------------------------38
[ 3.757200] [core0] ######## key=k39, value=v----------------------------39
[ 3.757700] [core0] ######## key=k3a, value=v----------------------------3a
[ 3.758200] [core0] ######## key=k3b, value=v----------------------------3b
[ 3.758800] [core0] ######## key=k3c, value=v----------------------------3c
[ 3.759300] [core0] ######## key=k3d, value=v----------------------------3d
[ 3.759800] [core0] ######## key=k3e, value=v----------------------------3e
[ 3.760300] [core0] ######## key=k3f, value=v----------------------------3f
[ 3.761100] [core0] ######## key=k40, value=v----------------------------40
[ 3.761700] [core0] ######## key=k41, value=v----------------------------41
[ 3.762200] [core0] ######## key=k42, value=v----------------------------42
[ 3.762700] [core0] ######## key=k43, value=v----------------------------43
[ 3.763200] [core0] ######## key=k44, value=v----------------------------44
[ 3.763800] [core0] ######## key=k45, value=v----------------------------45
[ 3.764300] [core0] ######## key=k46, value=v----------------------------46
[ 3.764800] [core0] ######## key=k47, value=v----------------------------47
[ 3.765400] [core0] ######## key=k48, value=v----------------------------48
[ 3.766000] [core0] ######## key=k49, value=v----------------------------49
[ 3.766600] [core0] ######## key=k4a, value=v----------------------------4a
[ 3.767100] [core0] ######## key=k4b, value=v----------------------------4b
[ 3.767600] [core0] ######## key=k4c, value=v----------------------------4c
[ 3.768200] [core0] ######## key=k4d, value=v----------------------------4d
[ 3.768800] [core0] ######## key=k4e, value=v----------------------------4e
[ 3.769300] [core0] ######## key=k4f, value=v----------------------------4f
[ 3.769900] [core0] ######## key=k50, value=v----------------------------50
[ 3.771100] [core0] ######## key=k51, value=v----------------------------51

Laczen · 2026-01-19T20:26:06Z

@zhaoxingyu12 does NuttX have the possibility to distinguish between devices that require erase and devices that don't? Even for devices that do not require erase the benefits of zms over nvs (emulating a erase by writing 0xff) is very limited. I am unsure that the addition of zms (with associated maintenance) can be justified.

xiaoxiang781216 · 2026-01-20T06:20:55Z

@zhaoxingyu12 does NuttX have the possibility to distinguish between devices that require erase and devices that don't? Even for devices that do not require erase the benefits of zms over nvs (emulating a erase by writing 0xff) is very limited. I am unsure that the addition of zms (with associated maintenance) can be justified.

@Laczen you can check whether mtd driver implement mtd_dev_s::erase.

Laczen · 2026-01-20T07:50:53Z

@zhaoxingyu12 does NuttX have the possibility to distinguish between devices that require erase and devices that don't? Even for devices that do not require erase the benefits of zms over nvs (emulating a erase by writing 0xff) is very limited. I am unsure that the addition of zms (with associated maintenance) can be justified.

@Laczen you can check whether mtd driver implement mtd_dev_s::erase.

@xiaoxiang781216 this could be done, but this might break other drivers. E.g. the rwbuffer directly calls the underlying mtd_erase method.

xiaoxiang781216 · 2026-01-20T09:13:29Z

@zhaoxingyu12 does NuttX have the possibility to distinguish between devices that require erase and devices that don't? Even for devices that do not require erase the benefits of zms over nvs (emulating a erase by writing 0xff) is very limited. I am unsure that the addition of zms (with associated maintenance) can be justified.

@Laczen you can check whether mtd driver implement mtd_dev_s::erase.

@xiaoxiang781216 this could be done, but this might break other drivers. E.g. the rwbuffer directly calls the underlying mtd_erase method.

All places already add the check, I think. @zhaoxingyu12 please confirm this.

improve the speed of finding the target ate Signed-off-by: guohao15 <guohao15@xiaomi.com>

change filename mtd/mtd_config_fs.c to mtd/mtd_config_nvs.c and optimize the configuration related to mtdconfig Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

For nvs test in qemu Signed-off-by: guohao15 <guohao15@xiaomi.com>

The structure of mtd_config in Kconfig has changed. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

…y_path api mtd_config/mtd_config_nvs should all support mtdconfig_register_by_path/mtdconfig_unregister_by_path api Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

For the MTD_CONFIG configuration item in drivers/mtd/Kconfig has changed. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

xiaoxiang781216 · 2026-01-20T14:31:47Z

@zhaoxingyu12 please fix the following error:

====================================================================================
Configuration/Tool: esp32c3-legacy-devkit/nvcfgdata
2026-01-20 13:56:42
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Building NuttX...
  [1/1] Normalize esp32c3-legacy-devkit/nvcfgdata
46d45
< CONFIG_SYSTEM_CFGDATA=y
48d46
< CONFIG_TESTING_MTD_CONFIG_FAIL_SAFE=y
Saving the new configuration file
HEAD detached at pull/18024/merge
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   boards/risc-v/esp32c3-legacy/esp32c3-legacy-devkit/configs/nvcfgdata/defconfig

michallenc · 2026-01-20T15:43:49Z

Shouldn't this be marked as breaking because of MTD_CONFIG_FAIL_SAFE removal?

zhaoxingyu12 · 2026-01-20T15:51:04Z

@zhaoxingyu12 please fix the following error:

====================================================================================
Configuration/Tool: esp32c3-legacy-devkit/nvcfgdata
2026-01-20 13:56:42
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Building NuttX...
  [1/1] Normalize esp32c3-legacy-devkit/nvcfgdata
46d45
< CONFIG_SYSTEM_CFGDATA=y
48d46
< CONFIG_TESTING_MTD_CONFIG_FAIL_SAFE=y
Saving the new configuration file
HEAD detached at pull/18024/merge
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   boards/risc-v/esp32c3-legacy/esp32c3-legacy-devkit/configs/nvcfgdata/defconfig

Does it mean to remove these two configs in boards/risc-v/esp32c3-legacy/esp32c3-legacy-devkit/configs/nvcfgdata/defconfig?
CONFIG_SYSTEM_CFGDATA=y
CONFIG_TESTING_MTD_CONFIG_FAIL_SAFE=y

i think #18024 and apache/nuttx-apps#3344 compiling together can fix it . but i dont know how to put the nuttx and nuttx-apps cict together

zhaoxingyu12 · 2026-01-20T16:34:17Z

@zhaoxingyu12 does NuttX have the possibility to distinguish between devices that require erase and devices that don't? Even for devices that do not require erase the benefits of zms over nvs (emulating a erase by writing 0xff) is very limited. I am unsure that the addition of zms (with associated maintenance) can be justified.

@Laczen you can check whether mtd driver implement mtd_dev_s::erase.

@xiaoxiang781216 this could be done, but this might break other drivers. E.g. the rwbuffer directly calls the underlying mtd_erase method.

All places already add the check, I think. @zhaoxingyu12 please confirm this.

@xiaoxiang781216 @Laczen It is currently only used in mtd_partition, and has (part->child.erase = mtd->erase ? part_erase : NULL; ) check in mtd_partition.
I will fully check other drivers.

xiaoxiang781216 · 2026-01-21T02:28:19Z

@zhaoxingyu12 please fix:

====================================================================================
Configuration/Tool: esp32c3-legacy-devkit/nvcfgdata
2026-01-20 13:56:42
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Building NuttX...
  [1/1] Normalize esp32c3-legacy-devkit/nvcfgdata
46d45
< CONFIG_SYSTEM_CFGDATA=y
48d46
< CONFIG_TESTING_MTD_CONFIG_FAIL_SAFE=y

the tasking compiler reports the error: expression must be constant in line 510 Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

Deleting a non-existent key-value pair is deemed a successful deletion. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

xiaoxiang781216 · 2026-01-21T06:11:10Z

@zhaoxingyu12 fix the ci style error:

../nuttx/tools/checkpatch.sh -c -u -m -g c95b6b1bb6f63e70fcf0c1eb522194bc2ab65778..HEAD
❌ Commit subject too long > 80
Used config files:

Enhance the robustness of ATE traversal. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

The purpose is to reduce the conflict rate of ate CRC and verify the data Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

use a fixed size buffer on stack instead of vla, When it needs to pass misra-c check Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

when enable MTD_CONFIG_BUFFER_SIZE, 1669:10: error: unused variable 'ate_size' [-Werror=unused-variable] 1669 | size_t ate_size = nvs_ate_size(fs); 2160:10: error: unused variable 'ate_size' [-Werror=unused-variable] 2160 | size_t ate_size = nvs_ate_size(fs); Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

Remove dirty data to ensure sufficient available storage space in the flash memory. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

When key string found corrupted during garbage collection, then remove key-value pair from the flash. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

Invalid data is cleared during garbage collection rather than deleted during initialization, thus accelerating the initialization speed. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

zhaoxingyu12 · 2026-01-21T06:54:34Z

@zhaoxingyu12 fix the ci style error:

../nuttx/tools/checkpatch.sh -c -u -m -g c95b6b1bb6f63e70fcf0c1eb522194bc2ab65778..HEAD
❌ Commit subject too long > 80
Used config files:

done

zhaoxingyu12 requested review from btashton, hartmannathan, jerpelea, michallenc, pkarashchenko, raiden00pl, simbit18 and xiaoxiang781216 as code owners January 19, 2026 17:59

github-actions bot added Area: Drivers Drivers issues Area: File System File System issues Board: arm Board: risc-v Size: XL The size of the change in this PR is very large. Consider breaking down the PR into smaller pieces. labels Jan 19, 2026

zhaoxingyu12 force-pushed the master branch from 4ee4465 to 56a1d8e Compare January 19, 2026 18:23

zhaoxingyu12 force-pushed the master branch from 56a1d8e to 23e8ff3 Compare January 20, 2026 02:12

zhaoxingyu12 closed this Jan 20, 2026

zhaoxingyu12 reopened this Jan 20, 2026

zhaoxingyu12 force-pushed the master branch from 23e8ff3 to 6e9cfe9 Compare January 20, 2026 03:07

zhaoxingyu12 changed the title ~~add zms module for RRAM storage device~~ Optimization of mtdconfig module Jan 20, 2026

zhaoxingyu12 force-pushed the master branch from 6e9cfe9 to 2b0fa5f Compare January 20, 2026 03:13

github-actions bot added the Size: M The size of the change in this PR is medium label Jan 20, 2026

xiaoxiang781216 previously approved these changes Jan 20, 2026

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jerpelea changed the title ~~Optimization of mtdconfig module~~ drivers/mtd: Optimization of mtdconfig module Jan 20, 2026

jerpelea previously approved these changes Jan 20, 2026

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guohao15 and others added 2 commits January 20, 2026 17:47

mtd/nvs: add nvs cache buffer

cfcf4f0

improve the speed of finding the target ate Signed-off-by: guohao15 <guohao15@xiaomi.com>

mtdconfig: modify mtdconfig kconfig

3f4e8e1

change filename mtd/mtd_config_fs.c to mtd/mtd_config_nvs.c and optimize the configuration related to mtdconfig Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

guohao15 and others added 3 commits January 20, 2026 17:47

mtdconfig: support ram_mtdconfig device && lomtdconfig device

f947881

For nvs test in qemu Signed-off-by: guohao15 <guohao15@xiaomi.com>

mtdconfig: lomtdconfig device change to depends on !MTD_CONFIG_NONE

cf46299

The structure of mtd_config in Kconfig has changed. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

mtd/mtd_config: add mtdconfig_register_by_path/mtdconfig_unregister_b…

797ddef

…y_path api mtd_config/mtd_config_nvs should all support mtdconfig_register_by_path/mtdconfig_unregister_by_path api Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

zhaoxingyu12 force-pushed the master branch from 2b0fa5f to f7924e3 Compare January 20, 2026 09:47

mtdconfig: change the relevant judgments of mtd_config

2fc3af9

For the MTD_CONFIG configuration item in drivers/mtd/Kconfig has changed. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

zhaoxingyu12 force-pushed the master branch from f7924e3 to 2fc3af9 Compare January 20, 2026 13:12

zhaoxingyu12 added 2 commits January 21, 2026 13:29

mtd/nvs: Fix the issue of compilation failure using the tasking compiler

e9f7b13

the tasking compiler reports the error: expression must be constant in line 510 Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

mtdconfig/nvs: return 0 when delete a non-exist kv

859964e

Deleting a non-existent key-value pair is deemed a successful deletion. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

zhaoxingyu12 dismissed stale reviews from jerpelea and xiaoxiang781216 via dbe464b January 21, 2026 05:57

github-actions bot added the Size: L The size of the change in this PR is large label Jan 21, 2026

zhaoxingyu12 added 7 commits January 21, 2026 14:52

mtd_config/nvs: keep offset increasing during ate traversal

8c09d2c

Enhance the robustness of ATE traversal. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

mtd_config/nvs: add data crc8

4fa3ec5

The purpose is to reduce the conflict rate of ate CRC and verify the data Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

mtdconfig/nvs: use a fixed size buffer instead of vla

08055fa

use a fixed size buffer on stack instead of vla, When it needs to pass misra-c check Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

mtdconfig/nvs: add dirty data clean ablility

e3ed52e

Remove dirty data to ensure sufficient available storage space in the flash memory. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

mtdconfig/nvs: add key check when gc

2a8e3a6

When key string found corrupted during garbage collection, then remove key-value pair from the flash. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

mtdconfig/nvs: clean up block without valid data during GC

2c62bdc

Invalid data is cleared during garbage collection rather than deleted during initialization, thus accelerating the initialization speed. Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>

zhaoxingyu12 force-pushed the master branch from dbe464b to 2c62bdc Compare January 21, 2026 06:53

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drivers/mtd: Optimization of mtdconfig module #18024

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