This is a playground for Boot Linux on ESP32-S3.
Example kernel and rootfs images built from the above wiki sources as well as a toolchain archive
used hardware in this case: ESP32-S3-N8R8 DevKitC-1 from Espressif ( Octal-pSRAM )
Build:Mar 27 2021 rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT) SPIWP:0xee mode:DIO, clock div:1 load:0x3fce3810,len:0x1098 load:0x403c9700,len:0xa24 load:0x403cc700,len:0x2d04 entry 0x403c988c I (73) octal_psram: vendor id : 0x0d (AP) I (74) octal_psram: dev id : 0x02 (generation 3) I (74) octal_psram: density : 0x03 (64 Mbit) I (78) octal_psram: good-die : 0x01 (Pass) I (83) octal_psram: Latency : 0x01 (Fixed) I (89) octal_psram: VCC : 0x01 (3V) I (94) octal_psram: SRF : 0x01 (Fast Refresh) I (99) octal_psram: BurstType : 0x01 (Hybrid Wrap) I (105) octal_psram: BurstLen : 0x01 (32 Byte) I (111) octal_psram: Readlatency : 0x02 (10 cycles@Fixed) I (117) octal_psram: DriveStrength: 0x00 (1/1) I (123) esp_psram: Found 8MB PSRAM device I (127) esp_psram: Speed: 80MHz I (130) cpu_start: Pro cpu up. I (134) cpu_start: Starting app cpu, entry point is 0h40375298 greeting to the stuff :) I (143) cpu_start: DEBUG_we are on first way here start cpu1 I (149) cpu_start: DEBUG_we are marked as 1 on way to start cpu1 I (156) cpu_start: DEBUG_before_call start cpu1 I (161) cpu_start: DEBUG_after_call start cpu1 I (166) esp32s3-linux: eMbeddedHome-liosti-cpu1: 0h40375298 I (0) cpu_start: App cpu up. I (625) esp_psram: SPI SRAM memory test OK I (634) cpu_start: Pro cpu start user code I (634) cpu_start: cpu freq: 160000000 Hz I (634) cpu_start: Application information: I (637) cpu_start: Project name: linux_boot I (642) cpu_start: App version: v5.0.1-3-g8a29e7a6e1-dirty I (649) cpu_start: Compile time: May 16 2023 21:37:43 I (655) cpu_start: ELF file SHA256: 4fe4a4b6aaa3fc1b... I (661) cpu_start: ESP-IDF: v5.0.1-3-g8a29e7a6e1-dirty I (668) cpu_start: Min chip rev: v0.0 I (672) cpu_start: Max chip rev: v0.99 I (677) cpu_start: Chip rev: v0.0 I (682) heap_init: Initializing. RAM available for dynamic allocation: I (689) heap_init: At 3FC958A8 len 00053E68 (335 KiB): D/IRAM I (696) heap_init: At 3FCE9710 len 00005724 (21 KiB): STACK/DRAM I (702) heap_init: At 3FCF0000 len 00008000 (32 KiB): DRAM I (708) heap_init: At 600FE010 len 00001FF0 (7 KiB): RTCRAM I (715) esp_psram: Adding pool of 8192K of PSRAM memory to heap allocator I (723) spi_flash: detected chip: generic I (727) spi_flash: flash io: dio I (732) cpu_start: Starting scheduler on PRO CPU. I (0) cpu_start: Starting scheduler on APP CPU. I (752) esp_psram: Reserving pool of 32K of internal memory for DMA/internal allocations ptr = 0x42830000 ptr = 0x42b30000 [ 0.000000] Ignoring boot parameters at (ptrval) [ 0.000000] Linux version 6.3.0-00023-g0ac241590a6e (jcmvbkbc@octofox) (xtensa-generic-elf-gcc (GCC) 13.1.0, GNU ld (GNU Binutils) 2.40) #48 PREEMPT Tue May 16 7:54:35 PDT 2023 [ 0.000000] config ID: c2f0fffe:23090f1f [ 0.000000] earlycon: esp32uart0 at MMIO32 0x60000000 (options '115200n8') [ 0.000000] printk: bootconsole [esp32uart0] enabled [ 0.000000] ********************************************************** [ 0.000000] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** [ 0.000000] ** ** [ 0.000000] ** This system shows unhashed kernel memory addresses ** [ 0.000000] ** via the console, logs, and other interfaces. This ** [ 0.000000] ** might reduce the security of your system. ** [ 0.000000] ** ** [ 0.000000] ** If you see this message and you are not debugging ** [ 0.000000] ** the kernel, report this immediately to your system ** [ 0.000000] ** administrator! ** [ 0.000000] ** ** [ 0.000000] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** [ 0.000000] ********************************************************** [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x000000003c030000-0x000000003c82ffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x000000003c030000-0x000000003c82ffff] [ 0.000000] Initmem setup node 0 [mem 0x000000003c030000-0x000000003c82ffff] [ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768 [ 0.000000] pcpu-alloc: [0] 0 [ 0.000000] Built 1 zonelists, mobility grouping off. Total pages: 2032 [ 0.000000] Kernel command line: earlycon=esp32uart,mmio32,0x60000000,115200n8 console=ttyS0,115200n8 debug rw root=mtd:data no_hash_pointers [ 0.000000] Dentry cache hash table entries: 1024 (order: 0, 4096 bytes, linear) [ 0.000000] Inode-cache hash table entries: 1024 (order: 0, 4096 bytes, linear) [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off [ 0.000000] virtual kernel memory layout: [ 0.000000] lowmem : 0x3c030000 - 0x3c830000 ( 8 MB) [ 0.000000] .text : 0x42830000 - 0x42a0c044 ( 1904 kB) [ 0.000000] .rodata : 0x42a0d000 - 0x42a4b000 ( 248 kB) [ 0.000000] .data : 0x3c030000 - 0x3c0aa540 ( 489 kB) [ 0.000000] .init : 0x3c0aa540 - 0x3c0af080 ( 18 kB) [ 0.000000] .bss : 0x3c0af080 - 0x3c0e4800 ( 213 kB) [ 0.000000] Memory: 7320K/8192K available (1904K kernel code, 489K rwdata, 248K rodata, 94K init, 213K bss, 872K reserved, 0K cma-reserved) [ 0.000000] SLUB: HWalign=16, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [ 0.000000] rcu: Preemptible hierarchical RCU implementation. [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. [ 0.000000] NR_IRQS: 33 [ 0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention. [ 0.000000] clocksource: ccount: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 11945377789 ns [ 0.000088] sched_clock: 32 bits at 160MHz, resolution 6ns, wraps every 13421772796ns [ 0.008148] Calibrating delay loop (skipped)... 160.00 BogoMIPS preset [ 0.014339] pid_max: default: 4096 minimum: 301 [ 0.021267] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear) [ 0.026506] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear) [ 0.075270] rcu: Hierarchical SRCU implementation. [ 0.075912] rcu: Max phase no-delay instances is 1000. [ 0.088745] devtmpfs: initialized [ 0.113563] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.114812] futex hash table entries: 16 (order: -5, 192 bytes, linear) [ 0.134485] NET: Registered PF_NETLINK/PF_ROUTE protocol family [ 0.149657] platform soc: Fixed dependency cycle(s) with /soc/intc@600c2000 [ 0.211951] clocksource: Switched to clocksource ccount [ 0.259552] NET: Registered PF_INET protocol family [ 0.267673] IP idents hash table entries: 2048 (order: 2, 16384 bytes, linear) [ 0.288195] tcp_listen_portaddr_hash hash table entries: 1024 (order: 0, 4096 bytes, linear) [ 0.289368] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear) [ 0.297062] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear) [ 0.303063] TCP bind hash table entries: 1024 (order: 1, 8192 bytes, linear) [ 0.308938] TCP: Hash tables configured (established 1024 bind 1024) [ 0.319268] UDP hash table entries: 256 (order: 0, 4096 bytes, linear) [ 0.323134] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes, linear) [ 0.349941] workingset: timestamp_bits=30 max_order=11 bucket_order=0 [ 2.624891] 60000000.serial: ttyS0 at MMIO 0x60000000 (irq = 1, base_baud = 0) is a ESP32 UART [ 2.626783] printk: console [ttyS0] enabled [ 2.626783] printk: console [ttyS0] enabled [ 2.631380] printk: bootconsole [esp32uart0] disabled [ 2.631380] printk: bootconsole [esp32uart0] disabled [ 2.670188] physmap-flash 42830000.flash: physmap platform flash device: [mem 0x42830000-0x4302ffff] [ 2.672973] 2 fixed-partitions partitions found on MTD device 42830000.flash [ 2.676015] Creating 2 MTD partitions on "42830000.flash": [ 2.681614] 0x000000000000-0x000000300000 : "linux" [ 2.697240] 0x000000300000-0x000000880000 : "data" [ 2.698011] mtd: partition "data" extends beyond the end of device "42830000.flash" -- size truncated to 0x500000 [ 2.724379] NET: Registered PF_INET6 protocol family [ 2.760411] Segment Routing with IPv6 [ 2.765436] In-situ OAM (IOAM) with IPv6 [ 2.767987] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver [ 3.019707] cramfs: checking physical address 0x42b30000 for linear cramfs image [ 3.020575] cramfs: linear cramfs image on mtd:data appears to be 1764 KB in size [ 3.028006] VFS: Mounted root (cramfs filesystem) readonly on device 31:1. [ 3.034942] devtmpfs: mounted [ 3.037483] Freeing unused kernel image (initmem) memory: 16K [ 3.039701] This architecture does not have kernel memory protection. [ 3.047779] Run /sbin/init as init process [ 3.050206] with arguments: [ 3.054162] /sbin/init [ 3.055818] with environment: [ 3.058926] HOME=/ [ 3.061265] TERM=linux [ 5.723690] random: crng init done Starting syslogd: OK Starting klogd: OK Running sysctl: OK seedrng: can't create directory '/var/lib/seedrng': Read-only file system Starting network: Ok Welcome to Buildroot for ESP32-S3 by rudi ;-) (twitter.com/eMbeddedHome) buildroot login:
**To do: more things in the rootfs :)
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