Add documentation for how to test the mainline U-Boot on SpacemiT K3 Pico-ITX board, currently it still rely on using vendor FSBL.bin file to initialize DDR and boot U-Boot proper, and the opensbi firmware is built from an on-going mainline branch.
Signed-off-by: Yixun Lan <[email protected]> --- doc/board/spacemit/index.rst | 1 + doc/board/spacemit/spacemit-pico-itx.rst | 200 +++++++++++++++++++++++++++++++ 2 files changed, 201 insertions(+) diff --git a/doc/board/spacemit/index.rst b/doc/board/spacemit/index.rst index 71854e5735b..51918f0acc7 100644 --- a/doc/board/spacemit/index.rst +++ b/doc/board/spacemit/index.rst @@ -8,4 +8,5 @@ SpacemiT bananapi-f3 k1-mmc k1-spl + spacemit-pico-itx diff --git a/doc/board/spacemit/spacemit-pico-itx.rst b/doc/board/spacemit/spacemit-pico-itx.rst new file mode 100644 index 00000000000..18d11d6671b --- /dev/null +++ b/doc/board/spacemit/spacemit-pico-itx.rst @@ -0,0 +1,200 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +SpacemiT K3 Pico-ITX +==================== + +Building +~~~~~~~~ +1. Add a RISC-V toolchain to your PATH + +2. Setup cross compilation environment variable: + + .. code-block:: console + + export CROSS_COMPILE=<riscv64 toolchain prefix> + +3. U-Boot for SpacemiT K3 SoC requires OpenSBI in-development generic +platform object fw_dynamic.bin to be included in the Flattened Image +Tree blob. OpenSBI may be first built as below: + + .. code-block:: console + + # Clone OpenSBI fork sources with K3 specific patches + git clone https://github.com/spacemit-com/opensbi-upstream opensbi + cd opensbi + make PLATFORM=generic + +4. Then build U-Boot as following: + + .. code-block:: console + + cd <U-Boot-dir> + make spacemit_k3_defconfig + make OPENSBI=<OpenSBI-dir>/build/platform/generic/firmware/fw_dynamic.bin + +This will generate u-boot.itb + +Testing +~~~~~~~ +Currently there is no U-Boot SPL build target. It is required to use 'FSBL.bin' vendor +board support package SPL for DDR initialization and testing u-boot.itb. Please test with +fastboot command via USB download. + +First, retrieve Bianbu Linux image from archive_ and extract the FSBL.bin firmware. + +Second, hold the FEL button of Pico-ITX board, then press reset button and release it . +The board will enter into firmware download mode. + + .. code-block:: none + + sys: 0x10001200 + bm:2 + usb_init : enter 3296,3072 + usb_core_init : enter + DWC3_GRXTHRCFG:0x4400000 + ROM: usb download handler + rst + done H + setup= 0x1000680 0x400000, + rst + done H + setup= 0x290500 0x0, + setup= 0x1000680 0x120000, + setup= 0x2000680 0x90000, + setup= 0x2000680 0x200000, + setup= 0x3000680 0xff0000, + setup= 0x3020680 0xff0409, + setup= 0x3010680 0xff0409, + setup= 0x10900 0x0, + usb_rx_bytes : start len[4096] + setup= 0x3020680 0xff0409, + setup= 0x3040680 0xff0409, + +Run following command to test: + + .. code-block:: console + + fastboot stage FSBL.bin + fastboot continue + sleep 10 + fastboot stage u-boot.itb + fastboot continue + +.. _archive: https://archive.spacemit.com/image/k3/version/bianbu/v4.0.7/ +.. _uboot: https://bianbu-linux.spacemit.com/en/device/boot#21-firmware-layout + +Booting +~~~~~~~ +Sample boot log +~~~~~~~~~~~~~~~ + .. code-block:: none + + sys: 0x10001200 + bm:2 + usb_init : enter 3296,3072 + usb_core_init : enter + DWC3_GRXTHRCFG:0x4400000 + ROM: usb download handler + rst + done H + setup= 0x1000680 0x400000, + rst + done H + setup= 0x2f0500 0x0, + setup= 0x1000680 0x120000, + setup= 0x2000680 0x90000, + setup= 0x2000680 0x200000, + setup= 0x3000680 0xff0000, + setup= 0x3020680 0xff0409, + setup= 0x3010680 0xff0409, + setup= 0x10900 0x0, + usb_rx_bytes : start len[4096] + setup= 0x3020680 0xff0409, + setup= 0x3040680 0xff0409, + fastboot_handle_command: max-download-size + usb_tx_bytes : start len[14] + usb_rx_bytes : start len[4096] + fastboot_handle_command: 00072b20 + Starting download of 469792 bytes + usb_tx_bytes : start len[12] + usb_rx_bytes : start len[469792] + usb_tx_bytes : start len[4] + usb_rx_bytes : start len[4096] + fastboot_handle_command: continue + usb_tx_bytes : start len[4] + j... + U-Boot SPL 2022.10 (Sep 07 2026 - 11:31:13 +0000) + LPDDR5 total size: 16 GB, data rate: 6400 MT/s + DDR training consume 5625ms + .. + OpenSBI v1.9-72-g13a401f8 + ____ _____ ____ _____ + / __ \ / ____| _ \_ _| + | | | |_ __ ___ _ __ | (___ | |_) || | + | | | | '_ \ / _ \ '_ \ \___ \| _ < | | + | |__| | |_) | __/ | | |____) | |_) || |_ + \____/| .__/ \___|_| |_|_____/|____/_____| + | | + |_| + Platform Name : SpacemiT K3 Pico-ITX + Platform Features : medeleg + Platform HART Count : 8 + Platform HART Protection : pmp + Platform IPI Device : aclint-mswi + Platform Timer Device : aclint-mtimer @ 24000000Hz + Platform Console Device : uart8250 + Platform HSM Device : spacemit-k3-hsm + Platform PMU Device : --- + Platform Reboot Device : spacemit-p1-reset + Platform Shutdown Device : spacemit-p1-reset + Platform Suspend Device : --- + Platform CPPC Device : --- + Firmware Base : 0x100000000 + Firmware Size : 416 KB + Firmware RW Offset : 0x40000 + Firmware RW Size : 160 KB + Firmware Heap Offset : 0x57000 + Firmware Heap Size : 68 KB (total), 1 KB (reserved), 14 KB (used), 52 KB (free) + Firmware Scratch Size : 4096 B (total), 1472 B (used), 2624 B (free) + Runtime SBI Version : 3.0 + Standard SBI Extensions : time,rfnc,ipi,base,hsm,srst,pmu,dbcn,fwft,legacy,dbtr,sse + Experimental SBI Extensions : none + Domain0 Name : root + Domain0 Init Order : 0xffffffff + Domain0 Boot HART : 0 + Domain0 HARTs : 0x0*,0x1*,0x2*,0x3*,0x4*,0x5*,0x6*,0x7* + Domain0 Region00 : 0x0000000100000000-0x000000010003ffff M: (F,R,X) S/U: () + Domain0 Region01 : 0x0000000100040000-0x000000010007ffff M: (F,R,W) S/U: () + Domain0 Region02 : 0x00000000d4017000-0x00000000d4017fff M: (I,R,W) S/U: (R,W) + Domain0 Region03 : 0x00000000e081c000-0x00000000e081ffff M: (I,R,W) S/U: () + Domain0 Region04 : 0x0000000000000000-0xffffffffffffffff M: () S/U: (R,W,X) + Domain0 Next Address : 0x0000000102000000 + Domain0 Next Arg1 : 0x0000000102091398 + Domain0 Next Mode : S-mode + Domain0 SysReset : yes + Domain0 SysSuspend : yes + Boot HART ID : 0 + Boot HART Domain : root + Boot HART Priv Version : v1.12 + Boot HART Base ISA : rv64imafdcbvhx + Boot HART ISA Extensions : smaia,smstateen,sscofpmf,sstc,zicntr,zihpm,smcntrpmf,zicboz,zicbom,svpbmt,sdtrig,svade,ssstateen,v,f,d + Boot HART PMP Count : 16 + Boot HART PMP Granularity : 12 bits + Boot HART PMP Address Bits : 38 + Boot HART MHPM Info : 16 (0x0007fff8) + Boot HART Debug Triggers : 4 triggers + Boot HART MIDELEG : 0x0000000000003666 + Boot HART MEDELEG : 0x0000000000f0b509 + + <debug_uart> + + U-Boot 2026.10-rc4-00501-g9fba7b59df42 (Sep 22 2026 - 13:08:33 +0000) + + DRAM: 16 GiB + Core: 433 devices, 15 uclasses, devicetree: separate + Loading Environment from nowhere...Loading Environment from nowhere... OK + In: serial@d4017000 + Out: serial@d4017000 + Err: serial@d4017000 + Net: No ethernet found. + => -- 2.56.0
