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feat(dts): emit 64-bit initrd device-tree cells for large initramfs #25

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Merged
poemonsense merged 1 commit into from
Jul 10, 2026
Merged

feat(dts): emit 64-bit initrd device-tree cells for large initramfs #25

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4 changes: 2 additions & 2 deletions dts/nutshell.dts.in
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Expand Up @@ -30,8 +30,8 @@

chosen {
bootargs = "console=hvc0 earlycon=sbi";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;
};

memory@100000000 {
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4 changes: 2 additions & 2 deletions dts/spike-2core.dts.in
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Expand Up @@ -8,8 +8,8 @@
chosen {
stdout-path = &SERIAL0;
bootargs = "console=ttyS0 earlycon";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;
};
cpus {
#address-cells = <1>;
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4 changes: 2 additions & 2 deletions dts/spike.dts.in
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Expand Up @@ -8,8 +8,8 @@
chosen {
stdout-path = &SERIAL0;
bootargs = "console=ttyS0 earlycon";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;
};
cpus {
#address-cells = <1>;
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184 changes: 184 additions & 0 deletions dts/xiangshan-fpga-noAIA-mem128g-novec.dts.in
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@@ -0,0 +1,184 @@
/*
* XiangShan FPGA DTS used by the fpga board flow.
*
* 1. AIA is disabled, so Linux should only see the legacy CLINT + PLIC path.
* 2. UART16550 is exposed as the serial console.
*/

/dts-v1/;

/ {
compatible = "freechips,rocketchip-unknown-dev";
model = "xiangshan,Kunminghu-dev";
#address-cells = <2>;
#size-cells = <2>;
cpus {
#address-cells = <1>;
#size-cells = <0>;
timebase-frequency = <1000000>;

cpu0: cpu@0 {
compatible = "ICT,xiangshan", "riscv";
device_type = "cpu";
reg = <0x0>;
status = "okay";

d-cache-block-size = <64>;
d-cache-sets = <256>;
d-cache-size = <65536>;
d-tlb-sets = <1>;
d-tlb-size = <48>;
i-cache-block-size = <64>;
i-cache-sets = <256>;
i-cache-size = <65536>;
i-tlb-sets = <1>;
i-tlb-size = <48>;
mmu-type = "riscv,sv48";
clock-frequency = <0>;
timebase-frequency = <1000000>;
tlb-split;

/*
* Keep the Linux-friendly CPU capability description from the
* workload template while using the FPGA board interrupt/peripheral
* map below.
*/
riscv,isa = "rv64imafdcvh_smstateen_sscofpmf_sstc_zicntr_zihpm_svpbmt_sdtrig_smcsrind_sscsrind_svade";
riscv,isa-base = "rv64i";
riscv,isa-extensions =
"i", "m", "a", "f", "d", "c", "h",
"sdtrig", "sha", "shcounterenw", "shgatpa",
"shlcofideleg", "shtvala", "shvsatpa", "shvstvala",
"shvstvecd", "smcsrind", "smdbltrp",
"smmpm", "smnpm", "smrnmi", "smstateen",
"ss1p13", "ssccptr", "sscofpmf",
"sscounterenw", "sscsrind", "ssdbltrp", "ssnpm",
"sspm", "ssstateen", "ssstrict", "sstc",
"sstvala", "sstvecd", "ssu64xl", "supm",
"sv39", "sv48", "svade", "svbare", "svinval",
"svnapot", "svpbmt", "za64rs", "zacas", "zawrs",
"zba", "zbb", "zbc", "zbkb", "zbkc", "zbkx",
"zbs", "zcb", "zcmop", "zfa", "zfh", "zfhmin",
"zic64b",
"ziccamoa", "ziccif", "zicclsm", "ziccrse",
"zicntr", "zicond", "zicsr", "zifencei",
"zihintntl", "zihintpause", "zihpm", "zimop",
"zkn", "zknd", "zkne", "zknh", "zksed",
"zksh", "zkt";
riscv,cbom-block-size = <0x40>;
riscv,cboz-block-size = <0x40>;

next-level-cache = <&l2_cache>;

intc_cpu0: interrupt-controller {
#interrupt-cells = <1>;
compatible = "riscv,cpu-intc";
interrupt-controller;
};
};
};

l2_cache: l2-cache {
compatible = "cache";
cache-level = <2>;
cache-block-size = <64>;
cache-size = <1048576>;
};

memory: memory@80000000 {
device_type = "memory";
/*
* Static 64 GiB memory profile for SPEC CPU2026 speed workloads.
*/
reg = <0x0 0x80000000 0x20 0x00000000>;
};

reserved-memory {
#address-cells = <2>;
#size-cells = <2>;
ranges;

reserved0: buffer@0 {
no-map;
reg = <0x0 0x80000000 0x0 0x100000>;
};
};

soc {
#address-cells = <2>;
#size-cells = <2>;
compatible = "freechips,rocketchip-unknown-soc", "simple-bus";
ranges;

/*
* This FPGA image boots without AIA. Describe only the CLINT + PLIC
* interrupt topology that the software stack should probe.
*/
clint: clint@38000000 {
compatible = "riscv,clint0";
reg = <0x0 0x38000000 0x0 0x10000>;
reg-names = "control";
interrupts-extended = <&intc_cpu0 3 &intc_cpu0 7>;
};

debug-controller@38020000 {
compatible = "sifive,debug-013", "riscv,debug-013";
debug-attach = "jtag";
reg = <0x0 0x38020000 0x0 0x1000>;
reg-names = "control";
interrupts-extended = <&intc_cpu0 65535>;
};

PLIC: interrupt-controller@3c000000 {
compatible = "riscv,plic0";
#interrupt-cells = <1>;
interrupt-controller;
reg = <0x0 0x3c000000 0x0 0x4000000>;
reg-names = "control";
interrupts-extended = <&intc_cpu0 11 &intc_cpu0 9>;
riscv,max-priority = <7>;
riscv,ndev = <66>;
};

/*
* Board-specific FPGA peripheral: the external AXI UART16550 used as
* the Linux console on fpga. Keep the 32-bit MMIO spacing and the
* 50 MHz input clock to match the FPGA wrapper.
*/
uart0: serial@310b0000 {
compatible = "ns16550a";
reg = <0x0 0x310b0000 0x0 0x10000>;
reg-shift = <0x2>;
reg-io-width = <0x4>;
clock-frequency = <50000000>;
current-speed = <115200>;
//interrupt-parent = <&PLIC>;
//interrupts = <40>;
status = "okay";
};
};

aliases {
serial0 = &uart0;
};

chosen {
/*
* On this FPGA DTS the UART16550 interrupt is not wired into Linux
* (`interrupt-parent` / `interrupts` are intentionally absent above).
* `ttyS0` can still print early boot logs via polling/earlycon, but the
* normal console path becomes unreliable once Linux switches away from
* earlycon. When the UART interrupt is absent, use the SBI console
* (`hvc0`) instead.
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
cold-boot-harts = <&cpu0>;
};
};
};
4 changes: 2 additions & 2 deletions dts/xiangshan-fpga-noAIA-mem24g-novec.dts.in
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Expand Up @@ -173,8 +173,8 @@
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
Expand Down
4 changes: 2 additions & 2 deletions dts/xiangshan-fpga-noAIA-mem24g.dts.in
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Expand Up @@ -174,8 +174,8 @@
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
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4 changes: 2 additions & 2 deletions dts/xiangshan-fpga-noAIA-mem64g-novec.dts.in
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Expand Up @@ -173,8 +173,8 @@
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
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4 changes: 2 additions & 2 deletions dts/xiangshan-fpga-noAIA-mem64g.dts.in
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Expand Up @@ -174,8 +174,8 @@
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
Expand Down
4 changes: 2 additions & 2 deletions dts/xiangshan-fpga-noAIA-mem8g-novec.dts.in
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Expand Up @@ -174,8 +174,8 @@
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
Expand Down
4 changes: 2 additions & 2 deletions dts/xiangshan-fpga-noAIA-mem8g.dts.in
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Expand Up @@ -175,8 +175,8 @@
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
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4 changes: 2 additions & 2 deletions dts/xiangshan-fpga-noAIA-novec.dts.in
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Expand Up @@ -174,8 +174,8 @@
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
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4 changes: 2 additions & 2 deletions dts/xiangshan-fpga-noAIA.dts.in
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Expand Up @@ -175,8 +175,8 @@
*/
bootargs = "console=hvc0 earlycon=sbi loglevel=8";
stdout-path = "serial0:115200n8";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;

opensbi-config {
compatible = "opensbi,config";
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4 changes: 2 additions & 2 deletions dts/xiangshan.dts.in
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Expand Up @@ -35,8 +35,8 @@
};
chosen {
bootargs = "console=hvc0 earlycon=sbi";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;
};
L11: memory@80000000 {
device_type = "memory";
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4 changes: 2 additions & 2 deletions dts/yanqihu-2core.dts.in
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Expand Up @@ -35,8 +35,8 @@
};
chosen {
bootargs = "console=hvc0 earlycon=sbi";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;
};
L11: memory@80000000 {
device_type = "memory";
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4 changes: 2 additions & 2 deletions dts/yanqihu.dts.in
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Expand Up @@ -35,8 +35,8 @@
};
chosen {
bootargs = "console=hvc0 earlycon=sbi";
linux,initrd-start = <0x0 INITRAMFS_BEGIN>;
linux,initrd-end = <0x0 INITRAMFS_END>;
linux,initrd-start = <INITRAMFS_BEGIN_HI INITRAMFS_BEGIN_LO>;
linux,initrd-end = <INITRAMFS_END_HI INITRAMFS_END_LO>;
};
L11: memory@80000000 {
device_type = "memory";
Expand Down
16 changes: 13 additions & 3 deletions scripts/build-firmware-linux.sh
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Expand Up @@ -22,8 +22,14 @@ KERNEL_SIZE=$(stat -c%s "$KERNEL_IMAGE")
KERNEL_SIZE_MB=$(( (KERNEL_SIZE + MEGABYTE - 1) / MEGABYTE ))
INITRAMFS_OFFSET_MB=$(( KERNEL_OFFSET_MB + KERNEL_SIZE_MB ))
INITRAMFS_SIZE=$(stat -c%s "$CPIO_ARCHIVE")
INITRAMFS_BEGIN_HEX=$(printf "0x%x" $(( MEM_BEGIN + INITRAMFS_OFFSET_MB*MEGABYTE )))
INITRAMFS_END_HEX=$(printf "0x%x" $(( INITRAMFS_BEGIN_HEX + INITRAMFS_SIZE )))
INITRAMFS_BEGIN_ADDR=$(( MEM_BEGIN + INITRAMFS_OFFSET_MB*MEGABYTE ))
INITRAMFS_END_ADDR=$(( INITRAMFS_BEGIN_ADDR + INITRAMFS_SIZE ))
INITRAMFS_BEGIN_HEX=$(printf "0x%x" "$INITRAMFS_BEGIN_ADDR")
INITRAMFS_END_HEX=$(printf "0x%x" "$INITRAMFS_END_ADDR")
INITRAMFS_BEGIN_HI=$(printf "0x%x" $(( INITRAMFS_BEGIN_ADDR >> 32 )))
INITRAMFS_BEGIN_LO=$(printf "0x%x" $(( INITRAMFS_BEGIN_ADDR & 0xffffffff )))
INITRAMFS_END_HI=$(printf "0x%x" $(( INITRAMFS_END_ADDR >> 32 )))
INITRAMFS_END_LO=$(printf "0x%x" $(( INITRAMFS_END_ADDR & 0xffffffff )))

# Build device tree files
DTC="${DTC:-dtc}"
Expand Down Expand Up @@ -84,7 +90,11 @@ build-dtb() {
local dts_file="$dt_dir/$dts_base.dts"
local dtb_file="$dt_dir/$dts_base.dtb"
mkdir -p "$dt_dir"
sed -e "s/INITRAMFS_BEGIN/$INITRAMFS_BEGIN_HEX/g" \
sed -e "s/INITRAMFS_BEGIN_HI/$INITRAMFS_BEGIN_HI/g" \
-e "s/INITRAMFS_BEGIN_LO/$INITRAMFS_BEGIN_LO/g" \
-e "s/INITRAMFS_END_HI/$INITRAMFS_END_HI/g" \
-e "s/INITRAMFS_END_LO/$INITRAMFS_END_LO/g" \
-e "s/INITRAMFS_BEGIN/$INITRAMFS_BEGIN_HEX/g" \
-e "s/INITRAMFS_END/$INITRAMFS_END_HEX/g" \
"$dts_template" > "$dts_file"
"$DTC" -I dts -O dtb -o "$dtb_file" "$dts_file"
Expand Down
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