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supported_devices:864_warning [2020/08/27 19:10] – Initial 8/64 warning page hnymansupported_devices:864_warning [2022/10/29 05:52] – [Analysis of firmware size growth] Update for 22.03 hnyman
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 **Insufficient RAM for stable operation** **Insufficient RAM for stable operation**
  
-  * 64 MB may have some issues with stability, depending on your hardware and use cases, although it is enough for basic usage +  * 32 MB RAM is already deprecated. You **will** run into issues with an up to date OpenWrt version. 
-  * 128 MB or more is recommended if software past basic router/AP functionality is to be used+  * 64 MB RAM may have some issues with stability, depending on your hardware and use cases, although it is enough for **basic** usage 
 +  * **128 MB RAM or more is recommended** if software past basic router/AP functionality is to be used 
  
-  * (32MB RAM is already deprecated) 
  
 ===== Extensibility issues ===== ===== Extensibility issues =====
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   * 8MB is barely enough (will fit LuCI and some other applications, but not many) / 16MB offers more flexibility   * 8MB is barely enough (will fit LuCI and some other applications, but not many) / 16MB offers more flexibility
-  * 8MB devices can be extended if you use [[docs:guide-user:additional-software:imagebuilder|the Image Generator (Image Builder)]] (that requires a Linux system and some mild experience) or use [[docs:guide-user:additional-software:extroot_configuration|Extroot]]. Experienced users creating custom builds may be able to [[docs:guide-user:additional-software:saving_space|Saving firmware space]], but many packages won't ever fit no matter what you do.+  * 8MB devices can be extended if you use [[docs:guide-user:additional-software:imagebuilder|the Image Generator (Image Builder)]] (that requires a Linux system and some mild experience) or use [[docs:guide-user:additional-software:extroot_configuration|Extroot]]. Experienced users creating custom builds may be able to [[docs:guide-user:additional-software:saving_space|save firmware space]], but many packages won't ever fit no matter what you do.
   * If you want to be sure you can install at least a few additional software packages, **16MB (or more) of flash** and **128MB (or more) of RAM** are the recommended choice.   * If you want to be sure you can install at least a few additional software packages, **16MB (or more) of flash** and **128MB (or more) of RAM** are the recommended choice.
  
-As the current OpenWrt master (and the forthcoming 20.releaseuses kernel 5.4 that is roughly 0.5 MB larger than the kernel 4.14 used in the old 19.07.x releases, the free flash space available on 8MB flash systems will be rather small in the next OpenWrt releases.+As the current stable 21.02 release uses kernel 5.4 that is roughly 0.5 MB larger than the kernel 4.14 used in the old 19.07.x releases, and SSL/HTTPS has been enabled by default needing at least some 0.3 MB flash space for the SSL libraries, the free flash space available on 8MB flash systems will be rather small in the current OpenWrt 21.02 release. OpenWrt master has already partially moved to kernel 5.10, which is still larger
  
-Flash space is also needed for bootloader (u-boot, etc.), bootloader settings, wifi firmware/calibration data, possible OEM settings (for ability to revert to OEM firmware) and for the jffs2/ubifs overlay space (OpenWRT config storage). Thus the maximum available flash size e.g. in a 8MB flash is actually typically 7MB or les+Flash space is also needed for bootloader (u-boot, etc.), bootloader settings, wifi firmware/calibration data, possible OEM settings (for ability to revert to OEM firmware) and for the jffs2/ubifs overlay space (OpenWRT config storage). Thus the maximum available flash size e.g. in a 8MB flash is actually typically 7MB or less.
  
 ===== Advice ===== ===== Advice =====
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 **16/64 as an //absolute// minimum for any device, with at least 128 MB of RAM being preferred.**   **16/64 as an //absolute// minimum for any device, with at least 128 MB of RAM being preferred.**  
  
-Users should expect that devices with less than 16 MB of flash and/or 64 MB of RAM may be unstable in basic operation under the current version of OpenWrt (19.07.x and newer). They should further expect that support for the device may be dropped in future.+Users should expect that devices with less than 16 MB of flash and/or 64 MB of RAM may be unstable in basic operation under the current version of OpenWrt (19.07.x, 21.02.x and newer). They should further expect that support for the device may be dropped in future.
  
 ===== Analysis of firmware size growth ===== ===== Analysis of firmware size growth =====
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 <code> <code>
-master / 20.x4736.KB +master:        5824.3 KB (snapshot without LuCI) 
-19.07.3:       4096.3 KB+22.03.2      5952.3 KB 
 +21.02.5:       5312.3 KB 
 +19.07.8:       4096.3 KB
 18.06.8:       3712.0 KB 18.06.8:       3712.0 KB
 17.01.7:       3584.0 KB 17.01.7:       3584.0 KB
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 Main reason is growth in size of the Linux kernel itself, but all included core packages (wifi, LuCI, etc.) also tend to grow as their features get expanded. Main reason is growth in size of the Linux kernel itself, but all included core packages (wifi, LuCI, etc.) also tend to grow as their features get expanded.
-s. 
  
-More thorough discussion can be found in the "4/32 warning" wiki article.+More thorough discussion can be found in [[supported_devices:432_warning|4/32 warning]].
  
  
  • Last modified: 2024/12/05 19:35
  • by palebloodsky