royzah commented on PR #20196:
URL: https://github.com/apache/nuttx/pull/20196#issuecomment-5794820569

   Run on hardware alongside #20191: i.MX93, Cortex-A55, PX4 kernel build,
   NuttX 12.11.0. With this change the ELE returns entropy on real silicon:
   
   ```
   hexdump /dev/random -c 32
   /dev/random at 00000000:
   0000: 7c 9a f9 b0 fb 89 be 9d 23 bf 17 28 88 43 67 10
   0010: c5 79 10 9e d7 be ca 42 2f 51 00 bd bc ce 77 54
   ```
   
   Worth recording: this depends on #20192. `imx9_ele.c` calls
   `up_addrenv_va_to_pa()`, so on any base predating that commit a kernel-mode
   build fails to link with
   
   ```
   imx9_ele.c:166: undefined reference to `up_addrenv_va_to_pa'
   ```
   
   A flat build hides it, because addrenv compiles out there. Both are merged
   upstream now, so this only affects backports.
   


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