It worked!

chibill@jwg1:/data_pool/ESPRust/xtensa-rust-quickstart$ xargo build --features="xtensa-lx-rt/lx6 xtensa-lx/lx6 esp32-hal"
  Downloaded void v1.0.2
  Downloaded darling v0.10.2
  Downloaded darling_core v0.10.2
  Downloaded strsim v0.9.3
  Downloaded nb v0.1.3
  Downloaded ident_case v1.0.1
  Downloaded vcell v0.1.2
  Downloaded nb v1.0.0
  Downloaded darling_macro v0.10.2
  Downloaded embedded-hal v0.2.4
  Downloaded esp32-hal-proc-macros v0.2.0
  Downloaded esp32-hal v0.2.0
  Downloaded esp32 v0.10.0
  Downloaded 13 crates (931.2 KB) in 1.23s
   Compiling xtensa-lx v0.3.0
   Compiling strsim v0.9.3
   Compiling ident_case v1.0.1
   Compiling fnv v1.0.7
   Compiling xtensa-lx-rt v0.5.0
   Compiling nb v1.0.0
   Compiling esp32 v0.10.0
   Compiling vcell v0.1.2
   Compiling void v1.0.2
   Compiling esp32-hal v0.2.0
   Compiling nb v0.1.3
   Compiling embedded-hal v0.2.4
   Compiling darling_core v0.10.2
   Compiling darling_macro v0.10.2
   Compiling darling v0.10.2
   Compiling esp32-hal-proc-macros v0.2.0
   Compiling xtensa-quickstart v0.1.0 (/data_pool/ESPRust/xtensa-rust-quickstart)
    Finished dev [unoptimized + debuginfo] target(s) in 23.17s