Support for Tamanu Iti HAT

Our HAT puts the LCD on SPI1 instead of SPI0 and we can take advantage
of the FBTFT driver instead of our hand-rolled driver code; that leaves
SPI0 for the TPM with enough space for EEPROM ID and two extra GPIOs.

Author: passcod

image/files/pi/config.txt

@@ -1,31 +1,23 @@
 # BES Linux — Raspberry Pi 5 boot config.
-# Read by the Pi 5 firmware (in EEPROM) at boot. flash-kernel populates the
-# kernel image, initramfs, DTB and overlays into this same FAT partition
-# (/boot/firmware) on every kernel update.
+# r[image.boot.pi-firmware]
 
-# r[image.boot.pi-firmware] r[image.boot.pi-uart] r[image.boot.pi-peripherals]
-# r[image.boot.pi-tpm-overlay] r[image.boot.pi-pcie-gen3]
-# enable_uart=1 tells the firmware to initialise the primary UART so the
-# kernel can inherit it as a console. On Pi 5 this is the dedicated 3-pin
-# debug UART connector (not GPIO 14/15 on the 40-pin header — that is a
-# different UART), and `console=serial0,115200` in cmdline.txt resolves
-# to it via the device-tree alias. HDMI may not be attached.
-# I2C and SPI are enabled for sensor / peripheral attach, paired with the
-# i2c-tools userspace package.
-# The tpm-slb9670 overlay enables the Infineon SLB9670 SPI TPM 2.0 module
-# on SPI0 CE1, for shipments that include a TPM HAT. With no TPM attached,
-# the kernel probes SPI, sees no response, and skips — boot is unaffected.
-# pciex1_gen=3 raises the Pi 5's onboard PCIe x1 lane from gen 2 to gen 3,
-# which roughly doubles sequential throughput for NVMe HATs. Older or
-# marginal drives may need to be flipped back to gen 2.
-# disable_splash=1 skips the rainbow splash on boot — cosmetic, but keeps
-# the console clean for headless servers.
 [all]
 disable_splash=1
+kernel=vmlinuz
+initramfs initrd.img followkernel
+
+# r[image.boot.pi-uart] r[image.boot.pi-peripherals]
 enable_uart=1
+
+# r[image.boot.pi-pcie-gen3]
+dtparam=pciex1_gen=3
+
+# r[image.boot.pi-peripherals]
 dtparam=i2c_arm=on
 dtparam=spi=on
-dtparam=pciex1_gen=3
+
+# TPM on SPI0 r[image.boot.pi-tpm-overlay]
 dtoverlay=tpm-slb9670
-kernel=vmlinuz
-initramfs initrd.img followkernel
+
+# LCD on SPI1 CE2
+dtoverlay=fbtft,spi1-3,st7789v,width=240,height=280,rotate=90,dc_pin=5,reset_pin=6,led_pin=26