TenstorrentのBlackholeには、4個のARC CPUが搭載されています。このARC上で動いているのが、tt-zephyr-platforms のようです。
今回は、公開されている tt-zephyr-platforms の中を覗いてみます。
NotebookLMの音声概要
tt-zephyr-platforms
今回は、Board の dts (P300) を見てみます。
Board の dts (P300)
P300
最初に、tt_blackhole_dmc.dtsi を includesしています。
/dts-v1/;
#include <st/g0/stm32g0b1Xe.dtsi>
#include <st/g0/stm32g0b1v(b-c-e)ix-pinctrl.dtsi>
#include "tt_blackhole_dmc.dtsi"
/* These two I/O have external pull-ups to 1.8V */
&i2c1_scl_pa9 {
/delete-property/ bias-pull-up;
};
&i2c1_sda_pa10 {
/delete-property/ bias-pull-up;
};
その下に、chip1 。
コメントを見ると、
- chip0 (right chip) : remote
- chip1 (left chip) : local
/*
* Left chip is local (comes up in non bifercation mode) this is referred to as chip1
* in the schematics
* Right chip is remote, and is referred to as chip0
*/
/ {
model = "Tenstorrent Blackhole p300 board";
compatible = "tenstorrent,blackhole,p300";
chosen {
zephyr,sram = &sram0;
zephyr,flash = &flash0;
zephyr,code-partition = &slot0_partition;
};
chip1: chip1 {
compatible = "tenstorrent,bh-chip";
asic_reset {
compatible = "zephyr,gpio-line";
label = "Line to asic reset";
gpios = <&gpiob 1 GPIO_ACTIVE_LOW>;
};
spi_reset {
compatible = "zephyr,gpio-line";
label = "Line to SPI reset";
gpios = <&gpioc 8 GPIO_ACTIVE_LOW>;
};
pgood {
compatible = "zephyr,gpio-line";
label = "PGOOD signal for asic 1";
gpios = <&gpioc 5 GPIO_PULL_DOWN>;
};
therm_trip {
compatible = "zephyr,gpio-line";
label = "Thermal trip indicator";
gpios = <&gpioc 9 GPIO_ACTIVE_HIGH>;
};
jtag {
compatible = "zephyr,jtag-gpio";
status = "okay";
tck-gpios = <&gpiod 9 GPIO_ACTIVE_HIGH>;
tdi-gpios = <&gpiod 10 GPIO_ACTIVE_HIGH>;
tdo-gpios = <&gpiod 11 GPIO_ACTIVE_HIGH>;
tms-gpios = <&gpiod 12 GPIO_ACTIVE_HIGH>;
port-write-cycles = <2>;
tck-delay = <1>;
};
strapping {
gpio6 {
compatible = "zephyr,gpio-line";
label = "GPIO pin representing strap gpio6";
gpios = <&chip1_strapping 4 GPIO_ACTIVE_HIGH>;
};
};
flash = <&chip1_flash>;
spi_mux {
compatible = "zephyr,gpio-line";
label = "Line to spi mux, drive low to enable dmfw -> eeprom";
gpios = <&gpiob 6 GPIO_ACTIVE_LOW>;
};
arc = <&chip1_arc>;
};
jtag が付いていますね。
jtag {
compatible = "zephyr,jtag-gpio";
status = "okay";
tck-gpios = <&gpiod 9 GPIO_ACTIVE_HIGH>;
tdi-gpios = <&gpiod 10 GPIO_ACTIVE_HIGH>;
tdo-gpios = <&gpiod 11 GPIO_ACTIVE_HIGH>;
tms-gpios = <&gpiod 12 GPIO_ACTIVE_HIGH>;
port-write-cycles = <2>;
tck-delay = <1>;
};
strapping {
gpio6 {
compatible = "zephyr,gpio-line";
label = "GPIO pin representing strap gpio6";
gpios = <&chip1_strapping 4 GPIO_ACTIVE_HIGH>;
};
};
Clock
Clock は、同じです。
&clk_lsi {
clock-frequency = <DT_FREQ_K(32)>;
status = "okay";
};
&clk_hsi {
clock-frequency = <DT_FREQ_M(16)>;
status = "okay";
};
&pll {
clocks = <&clk_hsi>;
div-m = <1>;
mul-n = <8>;
div-r = <2>;
div-q = <2>;
div-p = <2>;
status = "okay";
};
&rcc {
clocks = <&pll>;
clock-frequency = <DT_FREQ_M(64)>;
ahb-prescaler = <1>;
apb1-prescaler = <1>;
};
I2C
I2C も同じ
&i2c1 {
pinctrl-0 = <&i2c1_scl_pa9 &i2c1_sda_pa10>;
pinctrl-names = "default";
status = "okay";
clock-frequency = <I2C_BITRATE_FAST>;
ina228: ina228@40 {
compatible = "ti,ina228";
reg = <0x40>;
status = "okay";
/* max_current / (2^19) */
current-lsb-microamps = <210>;
rshunt-micro-ohms = <1000>;
};
gpiox0: gpio@38 {
compatible = "nxp,pca9554";
reg = <0x38>;
status = "okay";
ngpios = <8>;
/* external pull-up to 1.8V */
int-gpios = <&gpioa 1 GPIO_ACTIVE_LOW>;
gpio-controller;
#gpio-cells = <2>;
};
gpiox1: gpio@39 {
compatible = "nxp,pca9554";
reg = <0x39>;
status = "okay";
ngpios = <8>;
/* external pull-up to 1.8V */
int-gpios = <&gpioa 1 GPIO_ACTIVE_LOW>;
gpio-controller;
#gpio-cells = <2>;
};
gpiox2: gpio@3a {
compatible = "nxp,pca9554";
reg = <0x3a>;
status = "okay";
ngpios = <8>;
/* external pull-up to 1.8V */
int-gpios = <&gpioa 1 GPIO_ACTIVE_LOW>;
gpio-controller;
#gpio-cells = <2>;
};
gpiox3: gpio@3b {
compatible = "nxp,pca9554";
reg = <0x3b>;
status = "okay";
ngpios = <8>;
/* external pull-up to 1.8V */
int-gpios = <&gpioa 1 GPIO_ACTIVE_LOW>;
gpio-controller;
#gpio-cells = <2>;
};
};
&i2c3 {
pinctrl-0 = <&i2c3_scl_pa7 &i2c3_sda_pb4>;
pinctrl-names = "default";
status = "okay";
clock-frequency = <I2C_BITRATE_FAST>;
compatible = "st,tt-stm32-i2c";
scl-gpios = <&gpioa 7 GPIO_OPEN_DRAIN>;
sda-gpios = <&gpiob 4 GPIO_OPEN_DRAIN>;
bh_arc: i2c@54 {
compatible = "zephyr,i2c-target-eeprom";
reg = <0x54>;
status = "okay";
};
aardvark: eeprom@55 {
compatible = "zephyr,i2c-target-eeprom";
reg = <0x55>;
status = "okay";
};
};
SPI
&spi1 {
pinctrl-0 = <&spi1_nss_pa4 &spi1_sck_pb3
&spi1_miso_pa11 &spi1_mosi_pa12>;
pinctrl-names = "default";
status = "okay";
flash1: flash@0 {
/* base properties */
compatible = "jedec,spi-nor";
status = "okay";
reset-gpios = <&gpioc 7 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
/* spi-device properties */
reg = <0>;
spi-max-frequency = <7999999>;
spi-cpol;
spi-cpha;
/* jedec,spi-nor properties */
size = <DT_SIZE_M(512)>; /* Size in bits */
/* jedec,spi-nor-common properties */
has-dpd;
t-enter-dpd = <3000>;
t-exit-dpd = <30000>;
jedec-id = [20 bb 20];
};
};
FLASH
FLASH も同じ
&flash0 {
/* TODO:
* Move slot1_partition to spi flash.
* Ensure main flash erase size agrees with minimal subsector erase size of SPI flash,
* i.e. 4096 bytes. Currently sectors are 2048 bytes on stm32g071rb and this value is
* likely hard-coded in several places.
*/
/* erase-block-size = <4096>; */
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
boot_partition: partition@0 {
label = "mcuboot";
reg = <0x00000000 DT_SIZE_K(48)>;
read-only;
};
slot0_partition: partition@c000 {
label = "image-0";
reg = <0x0000c000 (DT_SIZE_K(230) + DT_SIZE_K(2))>;
};
slot1_partition: partition@46000 {
label = "image-1";
reg = <0x00046000 (DT_SIZE_K(230))>;
};
};
};
SMBUS
SMBUSは、ちょっと違いますね。
/*
* I2C1_SW_EN is F8
* I2C1 is I2C1
* I2C1 is Chip0
*/
&smbus1 {
status = "okay";
compatible = "st,tt-stm32-smbus";
chip0_arc: bh_arc@A {
compatible = "tenstorrent,bh-arc";
reg = <0xA>;
gpios = <&gpiof 8 GPIO_ACTIVE_LOW>;
};
};
/*
* I2C0_SW_EN is F9
* I2C0 is I2C3
* I2C0 is Chip1
*/
&smbus3 {
status = "okay";
compatible = "st,tt-stm32-smbus";
chip1_arc: bh_arc@A {
compatible = "tenstorrent,bh-arc";
reg = <0xA>;
gpios = <&gpiof 9 GPIO_ACTIVE_LOW>;
};
};
おわりに
P300の dts を見てみました。
というドキュメントがあります。
このドキュメントにしたがって、build するんですね。
