Add vmu rt1170 fcb

The FCB for this board is a bit unique in that it starts with a
relatively slow clock over standard SPI.

The board is then expected to reconfigure FlexSPI after boot with a
faster clock, quad spi, and a complete LUT of sequences based on how its
done in Zephyr.

Author: SpinFast

.github/workflows/rust.yml

@@ -41,7 +41,7 @@ jobs:
   fcbs:
     strategy:
       matrix:
-        fcb: ["imxrt1010evk-fcb", "imxrt1060evk-fcb", "imxrt1170evk-fcb", "imxrt1180evk-fcb"]
+        fcb: ["imxrt1010evk-fcb", "imxrt1060evk-fcb", "imxrt1170evk-fcb", "imxrt1180evk-fcb", "vmu-rt1170-fcb"]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4

fcbs/vmu-rt1170/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "vmu-rt1170-fcb"
+version = "0.1.0"
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+categories.workspace = true
+keywords.workspace = true
+description = "FlexSPI configuration block for NXP's VMU RT1170 Drone Control Board"
+
+[dependencies.imxrt-boot-gen]
+version = "0.3"
+path = "../.."
+features = ["imxrt1170"]
+
+[lib]
+path = "lib.rs"

fcbs/vmu-rt1170/lib.rs

@@ -0,0 +1,47 @@
+//! FlexSPI configuration block (FCB) for the iMXRT1170EVK.
+//!
+//! This FCB is compatible with thei Macronix MX25UM51345GXDI00 Hyperflash (Octal SPI) storage found on the
+//! VMU RT1170. However, it only supports reads.
+#![no_std]
+
+pub use nor::ConfigurationBlock;
+
+use imxrt_boot_gen::flexspi::{self, opcodes::sdr::*, *};
+use imxrt_boot_gen::serial_flash::*;
+
+const BOOT_SEQ_READ: Sequence = SequenceBuilder::new()
+    .instr(Instr::new(CMD, Pads::One, 0x03))
+    .instr(Instr::new(RADDR, Pads::One, 0x18))
+    .instr(Instr::new(READ, Pads::One, 0x04))
+    .instr(STOP)
+    .build();
+
+const BOOT_LUT: LookupTable = LookupTable::new().command(Command::Read, BOOT_SEQ_READ);
+
+const BOOT_CONFIGURATION_BLOCK: flexspi::ConfigurationBlock =
+    flexspi::ConfigurationBlock::new(BOOT_LUT)
+        .version(Version::new(1, 4, 0))
+        .read_sample_clk_src(ReadSampleClockSource::InternalLoopback)
+        .cs_hold_time(1)
+        .cs_setup_time(1)
+        .controller_misc_options(0x10)
+        .serial_flash_pad_type(FlashPadType::Single)
+        .serial_clk_freq(SerialClockFrequency::MHz80)
+        .flash_size(SerialFlashRegion::A1, 64 * 1024 * 1024);
+
+/// Boot FlexSPI NOR Configuration for the VMU only needs read commands
+/// over single wire SPI at a slower clock.
+///
+/// After booting the VMU can reconfigure FlexSPI to be clocked faster
+/// using OctalSPI as needed with the full LUT of command sequences.
+pub const BOOT_SERIAL_NOR_CONFIGURATION_BLOCK: nor::ConfigurationBlock =
+    nor::ConfigurationBlock::new(BOOT_CONFIGURATION_BLOCK)
+        .page_size(256)
+        .sector_size(4 * 1024)
+        .ip_cmd_serial_clk_freq(nor::SerialClockFrequency::MHz30)
+        .block_size(64 * 1024);
+
+#[no_mangle]
+#[cfg_attr(all(target_arch = "arm", target_os = "none"), link_section = ".fcb")]
+pub static FLEXSPI_CONFIGURATION_BLOCK: nor::ConfigurationBlock =
+    BOOT_SERIAL_NOR_CONFIGURATION_BLOCK;