extmod/vfs_lfsx: Allow overriding the LFS2 on-disk version format.

pi-anl · pi-anl · commit 5fa0a5e5141b · 2025-06-26T14:58:06.000+10:00
Useful for compatibility with older LFS versions.

Signed-off-by: Andrew Leech &lt;andrew.leech@planetinnovation.com.au&gt;
diff --git a/extmod/vfs_lfsx.c b/extmod/vfs_lfsx.c
@@ -104,6 +104,12 @@ static void MP_VFS_LFSx(init_config)(MP_OBJ_VFS_LFSx * self, mp_obj_t bdev, size
     config->read_buffer = m_new(uint8_t, config->cache_size);
     config->prog_buffer = m_new(uint8_t, config->cache_size);
     config->lookahead_buffer = m_new(uint8_t, config->lookahead_size);
+    #ifdef LFS2_MULTIVERSION
+    // This can be set to override the on-disk lfs version.
+    // eg. for compat with lfs2 < v2.6 add the following to make:
+    // CFLAGS += '-DLFS2_MULTIVERSION=0x00020000'
+    config->disk_version = LFS2_MULTIVERSION;
+    #endif
     #endif
 }
 
