Review fixups

Comments and readme

Author: will-v-pi

README.md

@@ -86,7 +86,7 @@ App|Description
 [channel_irq](dma/channel_irq) | Use an IRQ handler to reconfigure a DMA channel, in order to continuously drive data through a PIO state machine.
 [sniff_crc](dma/sniff_crc) | Use the DMA engine's 'sniff' capability to calculate a CRC32 on a data buffer.
 
-### Encrypted
+### Encrypted (RP235x Only)
 
 App|Description
 ---|---

encrypted/hello_encrypted/CMakeLists.txt

@@ -1,10 +1,10 @@
-# Example encrypted binard
+# Example encrypted binary
 add_executable(hello_encrypted
         hello_encrypted.c
         secret.S
         )
 
-# include secret.txt
+# include directory containing secret.txt
 target_include_directories(hello_encrypted PRIVATE ${CMAKE_CURRENT_LIST_DIR})
 
 # add dependency on secret.txt

encrypted/hello_encrypted/hello_encrypted.c

@@ -24,7 +24,7 @@ int main() {
             uint32_t flash_update_base = boot_info.reboot_params[0];
             if (flash_update_base) {
                 printf("Perform self-check... ");
-                if (1 == 1) {
+                if (1 == 1) {   // replace this with your actual self-check function
                     printf("passed\n");
                 } else {
                     printf("failed - looping forever\n");