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Add support for using XIP cache as SRAM #2932

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b8f699f
Separate linker scripts out into include files
will-v-pi Dec 1, 2025
6dc06e6
Add customisable heap location, with pico_set_linker_script_var function
will-v-pi Dec 1, 2025
727cabd
Add kitchen sink test of custom linker scripts
will-v-pi Dec 1, 2025
3a83dc7
Separate out rp2_common and platform-specific linker script sections
will-v-pi Dec 2, 2025
4b1a3ec
More de-duplication
will-v-pi Dec 2, 2025
ae97a22
Make overriding ram locations simpler
will-v-pi Dec 2, 2025
3811e67
Make it possible to reference default locations in pico_set_linker_sc…
will-v-pi Dec 4, 2025
a20f86a
Add pico_add_linker_script_override_path to make overriding individua…
will-v-pi Feb 11, 2026
6bd9e5b
Add simple overlay demo
will-v-pi Feb 26, 2026
2bf8555
Add scripts to bazel build
will-v-pi Feb 27, 2026
fe2d56b
Move linker scripts out of crt0
will-v-pi Mar 6, 2026
1bd7089
Make rp2350 text sections the default
will-v-pi Mar 6, 2026
72adb67
Rename scripts include directories to standard_scripts and platform_s…
will-v-pi Mar 6, 2026
e47fe09
Move and add example to Bazel docs for changing linker scripts
will-v-pi Mar 6, 2026
9c0ed0c
Add cc_library load to new bazel files
will-v-pi Mar 6, 2026
e44bdea
Add excludes.ld files for default memmap
will-v-pi Mar 16, 2026
dc3a2e8
Put mem functions in SRAM
will-v-pi Mar 16, 2026
8b9d9ec
Rename standard_scripts and platform_scripts to script_include
will-v-pi Mar 19, 2026
91c3a9a
Move pico_platform_link stuff into pico_plaftorm
will-v-pi Mar 19, 2026
614f7f0
Remove rigidity from linker include paths
will-v-pi Mar 19, 2026
da23cf4
Rename all linker scripts intended to be included to .incl
will-v-pi Mar 19, 2026
780c05e
Separate into section_... files which do only contain one section, an…
will-v-pi Mar 19, 2026
2e7ca67
Add section_extra files to make adding extra sections simpler
will-v-pi Mar 19, 2026
4180427
Fix comments, and add some more extra files
will-v-pi Mar 19, 2026
c122bf7
Add generated override files - currently unused, but can be overridde…
will-v-pi Mar 19, 2026
ea8320b
pico_add_linker_script_override_path can now be called after target_l…
will-v-pi Mar 19, 2026
ad35ad8
Add extra post_platform_end sections
will-v-pi Mar 19, 2026
8e3aca5
review fixups
will-v-pi Mar 19, 2026
737e8ba
Save/restore XIP cache state around flash functions
will-v-pi Sep 18, 2025
ae5122a
Fix PICO_USE_SW_SPIN_LOCKS=0 on RP2350
will-v-pi Sep 4, 2025
220086e
Working XIP SRAM binaries
will-v-pi Dec 3, 2025
d801abf
Merge branch 'develop' into xip-sram-new
will-v-pi May 12, 2026
c88dd9b
Change implementation to use pico_use_xip_sram_for_time_critical inst…
will-v-pi May 13, 2026
31fc968
Add some CMake function docs
will-v-pi May 13, 2026
b8631a7
Fix bazel and RP2350 build
will-v-pi May 13, 2026
d13ddb4
Fix bazel build
will-v-pi May 13, 2026
4428d39
Improve new __time_critical_func description
will-v-pi May 14, 2026
d7b4f6d
Add pico_test, and improve SRAM thrashing
will-v-pi May 14, 2026
394d9ad
fix bazel build
will-v-pi May 14, 2026
b74fd32
Merge remote-tracking branch 'origin/develop' into xip-sram-new
will-v-pi May 15, 2026
6a92324
fixup merge
will-v-pi May 15, 2026
67325b9
Move memory_xip_ram.incl to match location in other PRs
will-v-pi May 15, 2026
3af1971
Review fixups
will-v-pi May 18, 2026
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1 change: 1 addition & 0 deletions bazel/config/BUILD.bazel
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Original file line number Diff line number Diff line change
Expand Up @@ -237,6 +237,7 @@ string_flag(
"no_flash",
"copy_to_ram",
"blocked_ram",
"xip_ram",
],
)

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5 changes: 5 additions & 0 deletions bazel/constraint/BUILD.bazel
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Expand Up @@ -303,3 +303,8 @@ config_setting(
name = "pico_binary_type_blocked_ram",
flag_values = {"//bazel/config:PICO_DEFAULT_BINARY_TYPE": "blocked_ram"},
)

config_setting(
name = "pico_binary_type_xip_ram",
flag_values = {"//bazel/config:PICO_DEFAULT_BINARY_TYPE": "xip_ram"},
)
1 change: 1 addition & 0 deletions src/common/pico_base_headers/BUILD.bazel
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Expand Up @@ -78,6 +78,7 @@ cc_library(
"//bazel/constraint:pico_binary_type_no_flash": ["PICO_NO_FLASH=1"],
"//bazel/constraint:pico_binary_type_copy_to_ram": ["PICO_COPY_TO_RAM=1"],
"//bazel/constraint:pico_binary_type_blocked_ram": ["PICO_USE_BLOCKED_RAM=1"],
"//bazel/constraint:pico_binary_type_xip_ram": ["PICO_XIP_RAM=1"],
"//conditions:default": [],
}),
)
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1 change: 1 addition & 0 deletions src/rp2040/pico_platform/memmap_blocked_ram.ld
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Expand Up @@ -12,6 +12,7 @@ INCLUDE "memmap_default.incl"
* └── memmap_default.incl rp2_common/pico_standard_link
* ├── set_memory_locations.incl rp2_common/pico_standard_link
* ├── memory_flash.incl rp2_common/pico_standard_link
* ├── memory_xip_ram.incl rp2_common/pico_standard_link
* ├── memory_ram.incl rp2_common/pico_standard_link
* ├── memory_scratch.incl rp2_common/pico_standard_link
* ├── memory_generated.incl rp2_common/pico_standard_link
Expand Down
1 change: 1 addition & 0 deletions src/rp2040/pico_platform/memmap_copy_to_ram.ld
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Expand Up @@ -9,6 +9,7 @@ INCLUDE "memmap_copy_to_ram.incl"
* └── memmap_copy_to_ram.incl rp2_common/pico_standard_link
* ├── set_memory_locations.incl rp2_common/pico_standard_link
* ├── memory_flash.incl rp2_common/pico_standard_link
* ├── memory_xip_ram.incl rp2_common/pico_standard_link
* ├── memory_ram.incl rp2_common/pico_standard_link
* ├── memory_scratch.incl rp2_common/pico_standard_link
* ├── memory_generated.incl rp2_common/pico_standard_link
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1 change: 1 addition & 0 deletions src/rp2040/pico_platform/memmap_default.ld
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Expand Up @@ -9,6 +9,7 @@ INCLUDE "memmap_default.incl"
* └── memmap_default.incl rp2_common/pico_standard_link
* ├── set_memory_locations.incl rp2_common/pico_standard_link
* ├── memory_flash.incl rp2_common/pico_standard_link
* ├── memory_xip_ram.incl rp2_common/pico_standard_link
Comment thread
lurch marked this conversation as resolved.
* ├── memory_ram.incl rp2_common/pico_standard_link
* ├── memory_scratch.incl rp2_common/pico_standard_link
* ├── memory_generated.incl rp2_common/pico_standard_link
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1 change: 1 addition & 0 deletions src/rp2040/pico_platform/memmap_no_flash.ld
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Expand Up @@ -8,6 +8,7 @@ INCLUDE "memmap_no_flash.incl"
* memmap_no_flash.ld rp2040/pico_platform
* └── memmap_no_flash.incl rp2_common/pico_standard_link
* ├── set_memory_locations.incl rp2_common/pico_standard_link
* ├── memory_xip_ram.incl rp2_common/pico_standard_link
* ├── memory_ram.incl rp2_common/pico_standard_link
* ├── memory_scratch.incl rp2_common/pico_standard_link
* ├── memory_generated.incl rp2_common/pico_standard_link
Expand Down
24 changes: 24 additions & 0 deletions src/rp2350/pico_platform/BUILD.bazel
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Expand Up @@ -61,6 +61,7 @@ exports_files(
"memmap_copy_to_ram.ld",
"memmap_default.ld",
"memmap_no_flash.ld",
"memmap_xip_ram.ld",
],
)

Expand All @@ -79,6 +80,11 @@ linker_scripts(
link_scripts = ["memmap_no_flash.ld"],
)

linker_scripts(
name = "memmap_xip_ram",
link_scripts = ["memmap_xip_ram.ld"],
)

cc_library(
name = "default_linker_script",
target_compatible_with = ["//bazel/constraint:rp2350"],
Expand Down Expand Up @@ -133,3 +139,21 @@ cc_library(
"memmap_no_flash",
],
)

# PICO_BUILD_DEFINE: PICO_XIP_RAM, whether this is a 'xip_ram' build, type=bool, default=0, but dependent on CMake options, group=pico_standard_link
cc_library(
name = "xip_ram_linker_script",
target_compatible_with = ["//bazel/constraint:rp2350"],
visibility = [
"//src/rp2_common/pico_standard_link:__pkg__",
],
# The order of the linker scripts below is important.
# Prevent buildifier from reordering them.
# buildifier: leave-alone
deps = [
"//src/rp2_common/pico_crt0:no_warn_rwx_flag",
"//src/rp2350/pico_platform/script_include:rp2350_linker_scripts",
"//src/rp2_common/pico_standard_link/script_include:rp2_linker_scripts",
"memmap_xip_ram",
],
)
1 change: 1 addition & 0 deletions src/rp2350/pico_platform/memmap_copy_to_ram.ld
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Expand Up @@ -9,6 +9,7 @@ INCLUDE "memmap_copy_to_ram.incl"
* └── memmap_copy_to_ram.incl rp2_common/pico_standard_link
* ├── set_memory_locations.incl rp2_common/pico_standard_link
* ├── memory_flash.incl rp2_common/pico_standard_link
* ├── memory_xip_ram.incl rp2_common/pico_standard_link
* ├── memory_ram.incl rp2_common/pico_standard_link
* ├── memory_scratch.incl rp2_common/pico_standard_link
* ├── memory_generated.incl rp2_common/pico_standard_link
Expand Down
1 change: 1 addition & 0 deletions src/rp2350/pico_platform/memmap_default.ld
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Expand Up @@ -9,6 +9,7 @@ INCLUDE "memmap_default.incl"
* └── memmap_default.incl rp2_common/pico_standard_link
* ├── set_memory_locations.incl rp2_common/pico_standard_link
* ├── memory_flash.incl rp2_common/pico_standard_link
* ├── memory_xip_ram.incl rp2_common/pico_standard_link
* ├── memory_ram.incl rp2_common/pico_standard_link
* ├── memory_scratch.incl rp2_common/pico_standard_link
* ├── memory_generated.incl rp2_common/pico_standard_link
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1 change: 1 addition & 0 deletions src/rp2350/pico_platform/memmap_no_flash.ld
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Expand Up @@ -8,6 +8,7 @@ INCLUDE "memmap_no_flash.incl"
* memmap_no_flash.ld rp2350/pico_platform
* └── memmap_no_flash.incl rp2_common/pico_standard_link
* ├── set_memory_locations.incl rp2_common/pico_standard_link
* ├── memory_xip_ram.incl rp2_common/pico_standard_link
* ├── memory_ram.incl rp2_common/pico_standard_link
* ├── memory_scratch.incl rp2_common/pico_standard_link
* ├── memory_generated.incl rp2_common/pico_standard_link
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42 changes: 42 additions & 0 deletions src/rp2350/pico_platform/memmap_xip_ram.ld
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@@ -0,0 +1,42 @@
INCLUDE "memmap_xip_ram.incl"

/* BEGIN_MEMMAP_INCLUDE_TREE
* This is the default include tree for this file (generated by tools/memmap_annotate.py
* and tools/memmap_include_tree.py). To override any files in this tree, see the
* pico_add_linker_script_override_path CMake function under pico_standard_link.
*
* memmap_xip_ram.ld rp2350/pico_platform
* └── memmap_xip_ram.incl rp2_common/pico_standard_link
* ├── set_memory_locations.incl rp2_common/pico_standard_link
* ├── memory_ram.incl rp2_common/pico_standard_link
* ├── memory_scratch.incl rp2_common/pico_standard_link
* ├── memory_generated.incl rp2_common/pico_standard_link
* ├── memory_extra.incl rp2_common/pico_standard_link
* ├── memory_aliases_xip_ram_only.incl rp2_common/pico_standard_link
* └── sections_no_flash.incl rp2_common/pico_standard_link
* ├── sections_no_flash_text.incl rp2_common/pico_standard_link
* │ ├── section_no_flash_text.incl rp2_common/pico_standard_link
* │ ├── section_no_flash_rodata.incl rp2_common/pico_standard_link
* │ ├── sections_arm_ex.incl rp2_common/pico_standard_link
* │ └── section_binary_info.incl rp2_common/pico_standard_link
* ├── section_generated_post_text.incl rp2_common/pico_standard_link
* ├── section_extra_post_text.incl rp2_common/pico_standard_link
* ├── sections_no_flash_data.incl rp2_common/pico_standard_link
* │ ├── section_no_flash_data.incl rp2_common/pico_standard_link
* │ ├── section_uninitialized_data.incl rp2_common/pico_standard_link
* │ ├── section_tls.incl rp2_common/pico_standard_link
* │ └── section_persistent_data.incl rp2_common/pico_standard_link
* ├── section_generated_post_data.incl rp2_common/pico_standard_link
* ├── section_extra_post_data.incl rp2_common/pico_standard_link
* ├── section_heap.incl rp2_common/pico_standard_link
* ├── sections_scratch.incl rp2_common/pico_standard_link
* ├── section_generated_post_scratch.incl rp2_common/pico_standard_link
* ├── section_extra_post_scratch.incl rp2_common/pico_standard_link
* ├── sections_stack.incl rp2_common/pico_standard_link
* ├── section_end.incl rp2_common/pico_standard_link
* ├── section_generated_post_end.incl rp2_common/pico_standard_link
* ├── section_extra_post_end.incl rp2_common/pico_standard_link
* ├── section_platform_end.incl rp2350/pico_platform
* ├── section_generated_post_platform_end.incl rp2_common/pico_standard_link
* └── section_extra_post_platform_end.incl rp2_common/pico_standard_link
* END_MEMMAP_INCLUDE_TREE */
13 changes: 10 additions & 3 deletions src/rp2_common/hardware_flash/flash.c
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Expand Up @@ -10,6 +10,7 @@
#if PICO_RP2040
#include "hardware/structs/io_qspi.h"
#include "hardware/structs/ssi.h"
#include "hardware/structs/xip.h"
#else
#include "hardware/structs/qmi.h"
#include "hardware/regs/otp_data.h"
Expand Down Expand Up @@ -127,7 +128,9 @@ static void __no_inline_not_in_flash_func(flash_rp2350_restore_qmi_cs1)(const fl


typedef struct flash_hardware_save_state {
#if !PICO_RP2040
#if PICO_RP2040
uint32_t xip_ctrl;
#else
flash_rp2350_qmi_save_state_t qmi_save;
#endif
uint32_t qspi_pads[count_of(pads_qspi_hw->io)];
Expand All @@ -139,7 +142,9 @@ static void __no_inline_not_in_flash_func(flash_save_hardware_state)(flash_hardw
for (size_t i = 0; i < count_of(pads_qspi_hw->io); ++i) {
state->qspi_pads[i] = pads_qspi_hw->io[i];
}
#if !PICO_RP2040
#if PICO_RP2040
state->xip_ctrl = xip_ctrl_hw->ctrl;
#else
flash_rp2350_save_qmi_cs1(&state->qmi_save);
#endif
}
Expand All @@ -148,7 +153,9 @@ static void __no_inline_not_in_flash_func(flash_restore_hardware_state)(flash_ha
for (size_t i = 0; i < count_of(pads_qspi_hw->io); ++i) {
pads_qspi_hw->io[i] = state->qspi_pads[i];
}
#if !PICO_RP2040
#if PICO_RP2040
xip_ctrl_hw->ctrl = state->xip_ctrl;
#else
// Tail call!
flash_rp2350_restore_qmi_cs1(&state->qmi_save);
#endif
Expand Down
4 changes: 2 additions & 2 deletions src/rp2_common/hardware_riscv_platform_timer/BUILD.bazel
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@@ -1,13 +1,13 @@
load("@rules_cc//cc:cc_library.bzl", "cc_library")
load("//bazel:defs.bzl", "compatible_with_rp2")
load("//bazel:defs.bzl", "compatible_with_rp2", "incompatible_with_config")

package(default_visibility = ["//visibility:public"])

cc_library(
name = "hardware_riscv_platform_timer",
hdrs = ["include/hardware/riscv_platform_timer.h"],
includes = ["include"],
target_compatible_with = compatible_with_rp2() + ["@platforms//cpu:riscv32"],
target_compatible_with = compatible_with_rp2() + incompatible_with_config("//bazel/constraint:rp2040"),
deps = [
"//src/rp2_common:hardware_structs",
"//src/rp2_common:pico_platform",
Expand Down
44 changes: 42 additions & 2 deletions src/rp2_common/hardware_sync_spin_lock/include/hardware/sync/spin_lock.h
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Expand Up @@ -10,62 +10,102 @@
#include "pico.h"
#include "hardware/sync.h"

// PICO_CONFIG: PICO_USE_SW_SPIN_LOCKS, Use software implementation for spin locks, type=bool, default=1 on RP2350 due to errata, group=hardware_sync
// PICO_CONFIG: PICO_USE_SW_SPIN_LOCKS, Use software implementation for spin locks, type=bool, default=1 on RP2350 due to errata E2, group=hardware_sync
#ifndef PICO_USE_SW_SPIN_LOCKS
#if PICO_RP2350
#define PICO_USE_SW_SPIN_LOCKS 1
#define PICO_USE_SW_SPIN_LOCKS !PICO_XIP_RAM
#endif
#endif

// PICO_CONFIG: PICO_SPINLOCK_ID_IRQ, Spinlock ID for IRQ protection, min=0, max=31, default=9, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_IRQ
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_IRQ 5
#else
#define PICO_SPINLOCK_ID_IRQ 9
#endif
#endif

// PICO_CONFIG: PICO_SPINLOCK_ID_TIMER, Spinlock ID for Timer protection, min=0, max=31, default=10, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_TIMER
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_TIMER 6
#else
#define PICO_SPINLOCK_ID_TIMER 10
#endif
#endif

// PICO_CONFIG: PICO_SPINLOCK_ID_HARDWARE_CLAIM, Spinlock ID for Hardware claim protection, min=0, max=31, default=11, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_HARDWARE_CLAIM
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_HARDWARE_CLAIM 7
#else
#define PICO_SPINLOCK_ID_HARDWARE_CLAIM 11
#endif
#endif

// PICO_CONFIG: PICO_SPINLOCK_ID_RAND, Spinlock ID for Random Number Generator, min=0, max=31, default=12, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_RAND
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_RAND 10
#else
#define PICO_SPINLOCK_ID_RAND 12
#endif
#endif

// PICO_CONFIG: PICO_SPINLOCK_ID_ATOMIC, Spinlock ID for atomics, min=0, max=31, default=13, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_ATOMIC
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_ATOMIC 11
#else
#define PICO_SPINLOCK_ID_ATOMIC 13
#endif
#endif
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lurch marked this conversation as resolved.

// PICO_CONFIG: PICO_SPINLOCK_ID_OS1, First Spinlock ID reserved for use by low level OS style software, min=0, max=31, default=14, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_OS1
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_OS1 18
#else
#define PICO_SPINLOCK_ID_OS1 14
#endif
#endif
Comment on lines +67 to +72
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@lurch lurch May 18, 2026

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For the PICO_SPINLOCK_IDs defined before this one, the newly-added #if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS sections are declaring a lower-numbered spinlock (than the old values), but for the PICO_SPINLOCK_IDs defined after this one, the newly-added #if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS sections are declaring a higher-numbered spinlock? 🤔

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@will-v-pi will-v-pi May 18, 2026

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See #2645

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@lurch lurch May 18, 2026

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Aha, thanks! 😆
Maybe the PR-description should be updated to say that this PR also supersedes #2645 ?


// PICO_CONFIG: PICO_SPINLOCK_ID_OS2, Second Spinlock ID reserved for use by low level OS style software, min=0, max=31, default=15, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_OS2
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_OS2 19
#else
#define PICO_SPINLOCK_ID_OS2 15
#endif
#endif

// PICO_CONFIG: PICO_SPINLOCK_ID_STRIPED_FIRST, Lowest Spinlock ID in the 'striped' range, min=0, max=31, default=16, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_STRIPED_FIRST
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_STRIPED_FIRST 20
#else
#define PICO_SPINLOCK_ID_STRIPED_FIRST 16
#endif
#endif

// PICO_CONFIG: PICO_SPINLOCK_ID_STRIPED_LAST, Highest Spinlock ID in the 'striped' range, min=0, max=31, default=23, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_STRIPED_LAST
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_STRIPED_LAST 25
#else
#define PICO_SPINLOCK_ID_STRIPED_LAST 23
#endif
#endif

// PICO_CONFIG: PICO_SPINLOCK_ID_CLAIM_FREE_FIRST, Lowest Spinlock ID in the 'claim free' range, min=0, max=31, default=24, group=hardware_sync
#ifndef PICO_SPINLOCK_ID_CLAIM_FREE_FIRST
#if PICO_RP2350 && !PICO_USE_SW_SPIN_LOCKS
#define PICO_SPINLOCK_ID_CLAIM_FREE_FIRST 26
#else
#define PICO_SPINLOCK_ID_CLAIM_FREE_FIRST 24
#endif
#endif

#ifdef PICO_SPINLOCK_ID_CLAIM_FREE_END
#warning PICO_SPINLOCK_ID_CLAIM_FREE_END has been renamed to PICO_SPINLOCK_ID_CLAIM_FREE_LAST
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