April 2022 - U-Boot

[PATCH 2/2] riscv: ae350: Fix OF_BOARD boot failure
by Andes 18 May '22

18 May '22

From: Rick Chen <rick(a)andestech.com> Disable BINMAN_FDT for ae350 boards which don't actually use it. Fixes: 836eac7c6fe3 ("fdt: Make OF_BOARD a bool option") Signed-off-by: Rick Chen <rick(a)andestech.com> --- configs/ae350_rv32_spl_defconfig | 1 + configs/ae350_rv32_spl_xip_defconfig | 1 + configs/ae350_rv64_spl_defconfig | 1 + configs/ae350_rv64_spl_xip_defconfig | 1 + 4 files changed, 4 insertions(+) diff --git a/configs/ae350_rv32_spl_defconfig b/configs/ae350_rv32_spl_defconfig index 2924c892f7..d46e8711c2 100644 --- a/configs/ae350_rv32_spl_defconfig +++ b/configs/ae350_rv32_spl_defconfig @@ -15,6 +15,7 @@ CONFIG_SPL_LOAD_FIT_ADDRESS=0x00200000 CONFIG_SYS_MONITOR_BASE=0x88000000 CONFIG_BOOTDELAY=3 CONFIG_BOARD_EARLY_INIT_F=y +# CONFIG_BINMAN_FDT is not set CONFIG_SYS_PROMPT="RISC-V # " CONFIG_CMD_IMLS=y CONFIG_CMD_MMC=y diff --git a/configs/ae350_rv32_spl_xip_defconfig b/configs/ae350_rv32_spl_xip_defconfig index 91e88a3341..7f15761329 100644 --- a/configs/ae350_rv32_spl_xip_defconfig +++ b/configs/ae350_rv32_spl_xip_defconfig @@ -17,6 +17,7 @@ CONFIG_SPL_LOAD_FIT_ADDRESS=0x80010000 CONFIG_SYS_MONITOR_BASE=0x88000000 CONFIG_BOOTDELAY=3 CONFIG_BOARD_EARLY_INIT_F=y +# CONFIG_BINMAN_FDT is not set CONFIG_SYS_PROMPT="RISC-V # " CONFIG_CMD_IMLS=y CONFIG_CMD_MMC=y diff --git a/configs/ae350_rv64_spl_defconfig b/configs/ae350_rv64_spl_defconfig index 27ea0b72f7..dfa4b823db 100644 --- a/configs/ae350_rv64_spl_defconfig +++ b/configs/ae350_rv64_spl_defconfig @@ -16,6 +16,7 @@ CONFIG_SPL_LOAD_FIT_ADDRESS=0x00200000 CONFIG_SYS_MONITOR_BASE=0x88000000 CONFIG_BOOTDELAY=3 CONFIG_BOARD_EARLY_INIT_F=y +# CONFIG_BINMAN_FDT is not set CONFIG_SYS_PROMPT="RISC-V # " CONFIG_CMD_IMLS=y CONFIG_CMD_MMC=y diff --git a/configs/ae350_rv64_spl_xip_defconfig b/configs/ae350_rv64_spl_xip_defconfig index 1c1bda6ee9..4b590e5950 100644 --- a/configs/ae350_rv64_spl_xip_defconfig +++ b/configs/ae350_rv64_spl_xip_defconfig @@ -18,6 +18,7 @@ CONFIG_SPL_LOAD_FIT_ADDRESS=0x80010000 CONFIG_SYS_MONITOR_BASE=0x88000000 CONFIG_BOOTDELAY=3 CONFIG_BOARD_EARLY_INIT_F=y +# CONFIG_BINMAN_FDT is not set CONFIG_SYS_PROMPT="RISC-V # " CONFIG_CMD_IMLS=y CONFIG_CMD_MMC=y -- 2.17.1

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[PATCH 1/2] riscv: ae350: Fix OF_BOARD boot failure
by Andes 18 May '22

18 May '22

From: Rick Chen <rick(a)andestech.com> Enable OF_HAS_PRIOR_STAGE for ae350 boards with OF_BOARD Fixes: 239d22c79520 ("fdt: Enable OF_HAS_PRIOR_STAGE for most boards with OF_BOARD") Signed-off-by: Rick Chen <rick(a)andestech.com> --- board/AndesTech/ax25-ae350/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/board/AndesTech/ax25-ae350/Kconfig b/board/AndesTech/ax25-ae350/Kconfig index e50f505a2b..91eec35f47 100644 --- a/board/AndesTech/ax25-ae350/Kconfig +++ b/board/AndesTech/ax25-ae350/Kconfig @@ -35,5 +35,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy imply SMP imply SPL_RAM_SUPPORT imply SPL_RAM_DEVICE + imply OF_HAS_PRIOR_STAGE endif -- 2.17.1

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[PATCH 00/11] Fuzzing and ASAN for sandbox
by Andrew Scull 18 May '22

18 May '22

This series sets up a basic fuzzing infrastructure that works with sandbox. The example fuzz test towards the end of the series will find something pretty quickly. That something is fixed by the series "virtio: Harden and test vring" that needs to be applied for the final patch in this series. There is some refactoring to stop using '.' prefixed sections that elf defines as being for system use and clang's ASAN instrumentation happily adds redzones between, but that's not what we want for things like linker lists where the linker script has carefully placed the sections contiguously. It may require patches from the "Fix misc ASAN reports" series to be applied as I've already dealt with the first set of ASAN reports from running the tests. >From v1: - corrected handling of EFI symbols by sandbox linker script - per comments, some renaming and explaining - dropped RFC for dlmalloc ASAN instrumentation (work required to improve it) - added patch to reduce logging noise in fuzzer Andrew Scull (12): sandbox: Fix EFI runtime symbol placement sandbox: Rename EFI runtime sections sandbox: Migrate getopt section to linker list linker_lists: Rename sections to remove . prefix sandbox: Add support for Address Sanitizer fuzzing_engine: Add fuzzing engine uclass test: fuzz: Add framework for fuzzing sandbox: Decouple program entry from sandbox init sandbox: Add libfuzzer integration sandbox: Implement fuzzing engine driver fuzz: virtio: Add fuzzer for vring virtio_ring: Reduce logging noise Kconfig | 16 +++ arch/Kconfig | 2 + arch/arc/cpu/u-boot.lds | 4 +- arch/arm/config.mk | 4 +- arch/arm/cpu/arm926ejs/sunxi/u-boot-spl.lds | 4 +- arch/arm/cpu/armv7/sunxi/u-boot-spl.lds | 4 +- arch/arm/cpu/armv8/u-boot-spl.lds | 4 +- arch/arm/cpu/armv8/u-boot.lds | 4 +- arch/arm/cpu/u-boot-spl.lds | 4 +- arch/arm/cpu/u-boot.lds | 6 +- arch/arm/mach-at91/arm926ejs/u-boot-spl.lds | 2 +- arch/arm/mach-at91/armv7/u-boot-spl.lds | 2 +- arch/arm/mach-omap2/u-boot-spl.lds | 4 +- arch/arm/mach-orion5x/u-boot-spl.lds | 4 +- arch/arm/mach-rockchip/u-boot-tpl-v8.lds | 4 +- arch/arm/mach-zynq/u-boot-spl.lds | 4 +- arch/arm/mach-zynq/u-boot.lds | 4 +- arch/m68k/cpu/u-boot.lds | 4 +- arch/microblaze/cpu/u-boot-spl.lds | 4 +- arch/microblaze/cpu/u-boot.lds | 4 +- arch/mips/config.mk | 2 +- arch/mips/cpu/u-boot-spl.lds | 4 +- arch/mips/cpu/u-boot.lds | 4 +- arch/nds32/cpu/n1213/u-boot.lds | 4 +- arch/nios2/cpu/u-boot.lds | 4 +- arch/powerpc/cpu/mpc83xx/u-boot.lds | 4 +- arch/powerpc/cpu/mpc85xx/u-boot-nand.lds | 4 +- arch/powerpc/cpu/mpc85xx/u-boot-nand_spl.lds | 4 +- arch/powerpc/cpu/mpc85xx/u-boot-spl.lds | 4 +- arch/powerpc/cpu/mpc85xx/u-boot.lds | 4 +- arch/riscv/cpu/u-boot-spl.lds | 4 +- arch/riscv/cpu/u-boot.lds | 4 +- arch/sandbox/config.mk | 15 ++- arch/sandbox/cpu/os.c | 97 ++++++++++++++++--- arch/sandbox/cpu/start.c | 12 +-- arch/sandbox/cpu/u-boot-spl.lds | 10 +- arch/sandbox/cpu/u-boot.lds | 41 ++++---- arch/sandbox/dts/test.dts | 4 + arch/sandbox/include/asm/fuzzing_engine.h | 25 +++++ arch/sandbox/include/asm/getopt.h | 19 ++-- arch/sandbox/include/asm/main.h | 18 ++++ arch/sandbox/include/asm/sections.h | 25 ----- arch/sandbox/lib/sections.c | 8 +- arch/sh/cpu/u-boot.lds | 4 +- arch/x86/cpu/u-boot-64.lds | 6 +- arch/x86/cpu/u-boot-spl.lds | 6 +- arch/x86/cpu/u-boot.lds | 6 +- arch/x86/lib/elf_ia32_efi.lds | 4 +- arch/x86/lib/elf_x86_64_efi.lds | 4 +- arch/xtensa/cpu/u-boot.lds | 2 +- arch/xtensa/include/asm/ldscript.h | 4 +- board/compulab/cm_t335/u-boot.lds | 4 +- board/cssi/MCR3000/u-boot.lds | 4 +- .../davinci/da8xxevm/u-boot-spl-da850evm.lds | 2 +- board/qualcomm/dragonboard820c/u-boot.lds | 4 +- board/samsung/common/exynos-uboot-spl.lds | 4 +- board/synopsys/iot_devkit/u-boot.lds | 4 +- board/ti/am335x/u-boot.lds | 4 +- board/vscom/baltos/u-boot.lds | 4 +- configs/sandbox_defconfig | 1 + doc/api/linker_lists.rst | 22 ++--- doc/develop/commands.rst | 4 +- doc/develop/driver-model/of-plat.rst | 4 +- drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/fuzz/Kconfig | 17 ++++ drivers/fuzz/Makefile | 8 ++ drivers/fuzz/fuzzing_engine-uclass.c | 28 ++++++ drivers/fuzz/sandbox_fuzzing_engine.c | 35 +++++++ drivers/virtio/virtio_ring.c | 4 +- include/dm/uclass-id.h | 1 + include/fuzzing_engine.h | 51 ++++++++++ include/linker_lists.h | 18 ++-- include/test/fuzz.h | 51 ++++++++++ test/Makefile | 1 + test/fuzz/Makefile | 8 ++ test/fuzz/cmd_fuzz.c | 82 ++++++++++++++++ test/fuzz/virtio.c | 72 ++++++++++++++ 78 files changed, 680 insertions(+), 204 deletions(-) create mode 100644 arch/sandbox/include/asm/fuzzing_engine.h create mode 100644 arch/sandbox/include/asm/main.h create mode 100644 drivers/fuzz/Kconfig create mode 100644 drivers/fuzz/Makefile create mode 100644 drivers/fuzz/fuzzing_engine-uclass.c create mode 100644 drivers/fuzz/sandbox_fuzzing_engine.c create mode 100644 include/fuzzing_engine.h create mode 100644 include/test/fuzz.h create mode 100644 test/fuzz/Makefile create mode 100644 test/fuzz/cmd_fuzz.c create mode 100644 test/fuzz/virtio.c -- 2.35.1.1178.g4f1659d476-goog

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[PATCH][RESEND] mtd: spi-nor-ids: Add Winbond W25Q128JW ID
by Marek Vasut 17 May '22

17 May '22

Add ID for Winbond W25Q128JW device. This is a 128 Mbit QSPI NOR. Tested on W25Q128JWPIM part. Signed-off-by: Marek Vasut <marex(a)denx.de> Cc: Horatiu Vultur <horatiu.vultur(a)microchip.com> Cc: Jagan Teki <jagan(a)amarulasolutions.com> Cc: Simon Goldschmidt <simon.k.r.goldschmidt(a)gmail.com> Cc: Stefan Roese <sr(a)denx.de> Cc: Vignesh R <vigneshr(a)ti.com> --- NOTE: This has been incorrectly marked in PW as Changes Requested --- drivers/mtd/spi/spi-nor-ids.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/mtd/spi/spi-nor-ids.c b/drivers/mtd/spi/spi-nor-ids.c index 763bab04c60..393a24b3162 100644 --- a/drivers/mtd/spi/spi-nor-ids.c +++ b/drivers/mtd/spi/spi-nor-ids.c @@ -345,6 +345,11 @@ const struct flash_info spi_nor_ids[] = { SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB) }, + { + INFO("w25q128jw", 0xef8018, 0, 64 * 1024, 256, + SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | + SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB) + }, { INFO("w25q256fw", 0xef6019, 0, 64 * 1024, 512, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | -- 2.35.1

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[PATCH 0/4] Add support for TPS65219 PMIC on AM64X-SKEVM
by Neil Armstrong 17 May '22

17 May '22

This serie adds support for the TPS65219 PMIC available on the E4 revision of the AM64X-SKEVM board. Neil Armstrong (4): power: add driver for the TPS65219 PMIC regulator: add driver for the TPS65219 BUCK & LDO regulators config: enable TPS65219 for am64x_evm_a53 boards ARM: dts: k3-am642-sk-u-boot: add PMIC node arch/arm/dts/k3-am642-sk-u-boot.dtsi | 61 +++ configs/am64x_evm_a53_defconfig | 6 + drivers/power/pmic/Kconfig | 6 + drivers/power/pmic/Makefile | 1 + drivers/power/pmic/tps65219.c | 88 +++++ drivers/power/regulator/Kconfig | 9 + drivers/power/regulator/Makefile | 1 + drivers/power/regulator/tps65219_regulator.c | 380 +++++++++++++++++++ include/power/tps65219.h | 46 +++ 9 files changed, 598 insertions(+) create mode 100644 drivers/power/pmic/tps65219.c create mode 100644 drivers/power/regulator/tps65219_regulator.c create mode 100644 include/power/tps65219.h -- 2.25.1

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[PATCH v5 00/17] enable menu-driven boot device selection
by Masahisa Kojima 16 May '22

16 May '22

This patch series adds the menu-driven boot device selection, by extending the existing "bootmenu" to include UEFI and distro_boot related entries, and supports menu-driven UEFI boot variable maintenance. This patch series also includes the removable media support that UEFI specification requires to support. The menu example is as follows. *** U-Boot Boot Menu *** bootmenu_00 : Boot 1. kernel bootmenu_01 : Boot 2. kernel bootmenu_02 : Reset board UEFI BOOT0000 : debian UEFI BOOT0001 : ubuntu UEFI BOOT0002 : mmc0:1 UEFI BOOT0003 : mmc0:2 UEFI BOOT0004 : nvme0:1 UEFI BOOT0005 : nvme0:2 UEFI BOOT0006 : usb0:2 UEFI BOOT0007 : usb1:1 UEFI BOOT0008 : usb1:2 distro_boot : usb0 distro_boot : scsi0 distro_boot : virtio0 distro_boot : dhcp Press UP/DOWN to move, ENTER to select, ESC/CTRL+C to quit [How to run on QEMU(arm64)] 1) clone source code $ git clone https://git.linaro.org/people/masahisa.kojima/u-boot.git \ -b kojima/bootmenu_v5_upstream_0428 --depth 1 2) prepare U-Boot .config $ make qemu_arm64_menuconfig then, enable CONFIG_CMD_BOOTMENU and CONFIG_AUTOBOOT_MENU_SHOW 3) run on QEMU(arm64) example $ qemu-system-aarch64 -machine virt,gic-version=3 -cpu cortex-a57 -m 4G -nographic \ -no-acpi -bios ./u-boot.bin -hda xxx.img [Major Changes] - rebased to v2022.07-rc1 - there is detailed changelog in each commit AKASHI Takahiro (2): efi_loader: export efi_locate_device_handle() efi_loader: bootmgr: add booting from removable media Masahisa Kojima (15): lib/charset: add u16_strlcat() function test: unit test for u16_strlcat() menu: always show the menu regardless of the number of entry menu: menu_get_choice() return -ENOENT if menu item is empty bootmenu: flush input buffer before waiting user key input bootmenu: update bootmenu_entry structure bootmenu: add UEFI boot entry into bootmenu bootmenu: add distro boot entry bootmenu: add Kconfig option not to enter U-Boot console bootmenu: factor out the user input handling efi_loader: menu-driven addition of UEFI boot option efi_loader: menu-driven deletion of UEFI boot variable efi_loader: menu-driven update of UEFI bootorder variable bootmenu: add removable media entries doc:bootmenu: add UEFI boot and distro boot support description cmd/Kconfig | 10 + cmd/bootmenu.c | 807 +++++++++---- common/menu.c | 142 ++- doc/usage/cmd/bootmenu.rst | 78 +- include/charset.h | 17 + include/config_distro_bootcmd.h | 14 +- include/efi_default_filename.h | 33 + include/efi_loader.h | 61 + include/menu.h | 20 + lib/charset.c | 22 + lib/efi_loader/Makefile | 1 + lib/efi_loader/efi_bootmenu_maintenance.c | 1245 +++++++++++++++++++++ lib/efi_loader/efi_bootmgr.c | 50 +- lib/efi_loader/efi_boottime.c | 59 +- lib/efi_loader/efi_console.c | 81 ++ lib/efi_loader/efi_disk.c | 11 + lib/efi_loader/efi_file.c | 75 +- test/unicode_ut.c | 50 + 18 files changed, 2518 insertions(+), 258 deletions(-) create mode 100644 include/efi_default_filename.h create mode 100644 lib/efi_loader/efi_bootmenu_maintenance.c -- 2.17.1

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[PATCH 00/10] dm: Experiments for reducing SPL memory usage
by Simon Glass 15 May '22

15 May '22

This series explores using the (not yet applied) tag support in driver model to reduce memory usage in SPL. This is particularly important on 64-bit machines, which use a ridiculously large 8 bytes for each pointer into what what is sometimes only 64KB of available memory. The primary focus of this series is struct udevice, which can be shrunk in various ways: - Including devres_head only when DEVRES is enabled (i.e. not in SPL) - Using tags instead of pointers for attached data like plat_, priv_ and driver_data - Using singly linked lists, currently not supported in U-Boot - Using a table index for the driver pointer and uclass pointer Together these bring the size of struct udevice down from 0xa0 (160) bytes to 0x30 (48) bytes. Another option is to drop the device name, although this is a pain for debugging. It would also be possible to implement doubly linked lists with a 16-bit index into malloc space, in SPL, thus reducing the overhead in each node from 16 bytes to 2, or just using a fixed-size list for each data structure, since the number of items is quite limited in SPL. To implement the tag side of things, functions like dev_set_parent_priv() need to be modified to call dev_tag_set_ptr(), and dev_get_parent_priv() needs to call dev_tag_get_ptr(). Note there has been some previous work: - tiny-dm analysis[1] which we decided was too disruptive - build-time instantiation, to reduce SPL code size[2]. [1] https://patchwork.ozlabs.org/project/uboot/cover/20200702211004.1491489-1-s… [2] https://u-boot.readthedocs.io/en/latest/develop/driver-model/of-plat.html#b… AKASHI Takahiro (1): RFC: dm: add tag support Simon Glass (9): Makefile: v2 Allow LTO to be disabled for a build sandbox: Correct loss of early output in SPL Makefile: Drop a stale comment about linking Makefile: Avoid resetting link flags in config.mk sandbox: Allow link flags to be given sandbox: Align linker lists to a 32-byte boundary dm: core: Allow devres to be disabled in SPL dm: core: Deal with a wrinkle with linker lists WIP: dm: core: Add a command to calculate memory usage Makefile | 22 ++-- arch/arm/config.mk | 4 +- arch/arm/include/asm/global_data.h | 2 +- arch/sandbox/config.mk | 4 +- arch/sandbox/cpu/os.c | 2 +- arch/sandbox/cpu/u-boot-spl.lds | 2 +- arch/sandbox/cpu/u-boot.lds | 2 +- cmd/dm.c | 15 ++- common/spl/spl.c | 9 ++ config.mk | 1 - doc/build/gcc.rst | 17 +++ drivers/core/Makefile | 4 +- drivers/core/device.c | 70 +++++++++++- drivers/core/dump.c | 73 +++++++++++++ drivers/core/root.c | 63 ++++++++++- drivers/core/tag.c | 168 +++++++++++++++++++++++++++++ include/asm-generic/global_data.h | 4 + include/dm/device-internal.h | 6 +- include/dm/device.h | 16 ++- include/dm/devres.h | 4 +- include/dm/root.h | 45 ++++++++ include/dm/tag.h | 126 ++++++++++++++++++++++ include/dm/util.h | 9 ++ scripts/Makefile.spl | 2 +- test/dm/Makefile | 2 +- 25 files changed, 640 insertions(+), 32 deletions(-) create mode 100644 drivers/core/tag.c create mode 100644 include/dm/tag.h -- 2.35.1.1021.g381101b075-goog

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[PATCH] imx8mn-*-evk: rename mkimage config
by Heiko Thiery 14 May '22

14 May '22

Since this configuration is used for several imx8mn-evk boards the suffix ddr4 is misleading. Signed-off-by: Heiko Thiery <heiko.thiery(a)gmail.com> --- board/freescale/imx8mn_evk/Kconfig | 2 +- .../imx8mn_evk/{imximage-8mn-ddr4.cfg => imximage-8mn.cfg} | 0 2 files changed, 1 insertion(+), 1 deletion(-) rename board/freescale/imx8mn_evk/{imximage-8mn-ddr4.cfg => imximage-8mn.cfg} (100%) diff --git a/board/freescale/imx8mn_evk/Kconfig b/board/freescale/imx8mn_evk/Kconfig index 80037c4401..38312a3662 100644 --- a/board/freescale/imx8mn_evk/Kconfig +++ b/board/freescale/imx8mn_evk/Kconfig @@ -13,7 +13,7 @@ config IMX8MN_LOW_DRIVE_MODE bool "Enable the low drive mode of iMX8MN on EVK board" config IMX_CONFIG - default "board/freescale/imx8mn_evk/imximage-8mn-ddr4.cfg" + default "board/freescale/imx8mn_evk/imximage-8mn.cfg" source "board/freescale/common/Kconfig" diff --git a/board/freescale/imx8mn_evk/imximage-8mn-ddr4.cfg b/board/freescale/imx8mn_evk/imximage-8mn.cfg similarity index 100% rename from board/freescale/imx8mn_evk/imximage-8mn-ddr4.cfg rename to board/freescale/imx8mn_evk/imximage-8mn.cfg -- 2.30.2

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[PATCH] devres: Use the correct devres implementation in SPL builds
by Alban Bedel 13 May '22

13 May '22

When CONFIG_DEVRES is set, but CONFIG_SPL_DM is not set devres code is not included in the SPL. But dm/devres.h only check for CONFIG_DEVRES to select if the full implementation should be used. So if any devres function is used in the SPL with this config the link fails. Fix the ifdef in the dm/devres.h to also check for CONFIG_SPL_DM in SPL builds. Signed-off-by: Alban Bedel <alban.bedel(a)aerq.com> --- include/dm/devres.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/dm/devres.h b/include/dm/devres.h index 0ab277ec38e9..8765b73d5e90 100644 --- a/include/dm/devres.h +++ b/include/dm/devres.h @@ -30,7 +30,8 @@ struct devres_stats { int total_size; }; -#ifdef CONFIG_DEVRES +/* devres is not available in SPL unless DM is enabled there */ +#if defined(CONFIG_DEVRES) && CONFIG_IS_ENABLED(DM) #ifdef CONFIG_DEBUG_DEVRES void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp, -- 2.32.0

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Bug in p1_p2_rdb_pc? Caching-inhibited bit for initial L2 SRAM entry in TLB
by Pali Rohár 12 May '22

12 May '22

Hello! I suspect that there is a bug in board/freescale/p1_p2_rdb_pc/tlb.c code which configures TLB entry for initial L2 SRAM. When L2 is 512 kB long (e.g. on P2020) then U-Boot *unsets* MAS2_I bit for first half of L2 and for second half of L2 U-Boot *sets* this bit. See code: https://source.denx.de/u-boot/u-boot/-/blob/v2022.04/board/freescale/p1_p2_… I do not think that one part of L2 SRAM should be configured differently as second part. Therefore I think that this is a bug in U-Boot code. Do you know is correct configuration of TLB entries for initial L2 SRAM? MAS2_I is Caching-inhibited bit which is described as: Caching-inhibited: * 0 - Accesses to this page are considered cacheable. * 1 - The page is considered caching-inhibited. All loads and stores to the page bypass the caches and are performed directly to main memory. A read or write to a caching-inhibited page affects only the memory element specified by the operation.

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