Nintendo Switch Brew

Package1: Difference between revisions

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6.2.0 changes
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=== Header ===
=== Header ===
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
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| 0x1E
| 0x1E
| 0x2
| 0x2
| Unknown (version?)
| Version
|-
|}
|}


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=== Main ===
=== Main ===
The bootloader poisons the exception vectors, cleans up memory (.bss and init_array), sets up hardware devices (including the security engine and fuses), does all the necessary checks, generates keys and finally decrypts and executes the next stage.
From firmware versions 1.0.0 to 6.1.0, the bootloader poisons the exception vectors, cleans up memory (.bss and init_array), sets up hardware devices (including the security engine and fuses), does all the necessary checks, generates keys and finally decrypts and executes the next stage.


<syntaxhighlight lang="c">
<syntaxhighlight lang="c">
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  // Setup I2S1, I2S2, I2S3, I2S4, DISPLAY and VIC
  // Setup I2S1, I2S2, I2S3, I2S4, DISPLAY and VIC
  enable_hw_devices();
  mbist_workaround();
   
   
  // Program the SE clock and resets
  // Program the SE clock and resets
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  return;
  return;
</syntaxhighlight>
Starting with firmware version 6.2.0, the bootloader maintains most of its design, but passes execution to a [[TSEC]] payload and is left in an infinite loop.
<syntaxhighlight lang="c">
// Poison all exception vectors
*(u32 *)0x6000F200 = panic();
*(u32 *)0x6000F204 = panic();
*(u32 *)0x6000F208 = panic();
*(u32 *)0x6000F20C = panic();
*(u32 *)0x6000F210 = panic();
*(u32 *)0x6000F214 = panic();
*(u32 *)0x6000F218 = panic();
*(u32 *)0x6000F21C = panic();
u32 bss_addr_end = bss_addr_start;
u32 bss_offset = 0;
u32 bss_size = bss_addr_end - bss_addr_start;
// Clear .bss region
// Never happens due to bss_size being set to 0
while (bss_offset < bss_size)
{
    *(u32 *)bss_addr_start + bss_offset = 0;
    bss_offset += 0x04;
}
u32 init_array_addr_end = init_array_addr_start;
u32 init_array_offset = init_array_addr_start;
// Call init methods
// Never happens due to init_array_addr_end being set to init_array_addr_start
while (init_array_offset < init_array_addr_end)
{
    u32 init_method_offset = *(u32 *)init_array_offset;
    call_init_method(init_method_offset + init_array_offset);
    init_array_offset += 0x04;
}
// Setup I2S1, I2S2, I2S3, I2S4, DISPLAY and VIC
mbist_workaround();
// Program the SE clock and resets
// Uses RST_DEVICES_V, CLK_OUT_ENB_V, CLK_SOURCE_SE and CLK_V_SE
enable_se_clkrst();
// Set MISC_CLK_ENB
// This makes fuse registers visible
enable_misc_clk(0x01);
// Setup the security engine's address
set_se_addr(0x70012000);
// Check SE global config
check_se_status();
// Read FUSE_SKU_INFO and compare with 0x83
check_sku();
// Check configuration fuses
check_config_fuses();
u32 bct_iram_addr = 0x40000000;
// Check bootloader version from BCT
check_bootloader_ver(bct_iram_addr);
// Check anti-downgrade fuses
check_downgrade();
// Setup memory controllers
enable_mem_ctl();
 
// Clear SYS_CLK_DIVISOR
*(u32 *)CLK_SOURCE_SYS = 0;
// Place I2C5 in reset
u32 rst_dev_h_val = *(u32 *)RST_DEVICES_H;
rst_dev_h_val &= ~(0x8000);
rst_dev_h_val |= 0x8000;
*(u32 *)RST_DEVICES_H = rst_dev_h_val;
// Program the HOST1X clock and resets
// Uses RST_DEVICES_L, CLK_OUT_ENB_L, CLK_SOURCE_HOST1X and CLK_L_HOST1X
enable_host1x_clkrst();
// Program the TSEC clock and resets
// Uses RST_DEVICES_U, CLK_OUT_ENB_U, CLK_SOURCE_TSEC and CLK_U_TSEC
enable_tsec_clkrst();
// Program the SOR_SAFE clock and resets
// Uses RST_DEVICES_Y, CLK_OUT_ENB_Y and CLK_Y_SOR_SAFE
enable_sor_safe_clkrst();
// Program the SOR0 clock and resets
// Uses RST_DEVICES_X, CLK_OUT_ENB_X and CLK_X_SOR0
enable_sor0_clkrst();
// Program the SOR1 clock and resets
// Uses RST_DEVICES_X, CLK_OUT_ENB_X, CLK_SOURCE_SOR1 and CLK_X_SOR1
enable_sor1_clkrst();
// Program the KFUSE clock resets
// Uses RST_DEVICES_H, CLK_OUT_ENB_H and CLK_H_KFUSE
enable_kfuse_clkrst();
// Clear the Falcon DMA control register
*(u32 *)FALCON_DMACTL = 0;
// Enable Falcon IRQs
*(u32 *)FALCON_IRQMSET = 0xFFF2;
// Enable Falcon IRQs
*(u32 *)FALCON_IRQDEST = 0xFFF0;
// Enable Falcon interfaces
*(u32 *)FALCON_ITFEN = 0x03;
// Wait for Falcon's DMA engine to be idle
wait_flcn_dma_idle();
// Set DMA transfer base address to 0x40010E00>> 0x08
*(u32 *)FALCON_DMATRFBASE = 0x40010E;
u32 trf_mode = 0;    // A value of 0 sets FALCON_DMATRFCMD_IMEM
u32 dst_offset = 0;
u32 src_offset = 0;
// Load code into Falcon (0x100 bytes at a time)
while (src_offset < 0x2900)
{
    flcn_load_firm(trf_mode, src_offset, dst_offset);
    src_offset += 0x100;
    dst_offset += 0x100;
}
// Set magic value in host1x scratch space
*(u32 *)0x50003300 = 0x34C2E1DA;
// Clear Falcon scratch1 MMIO
*(u32 *)FALCON_SCRATCH1 = 0;
// Set Falcon boot key version in scratch0 MMIO
*(u32 *)FALCON_SCRATCH0 = 0x01;
// Set Falcon's boot vector address
*(u32 *)FALCON_BOOTVEC = 0;
// Signal Falcon's CPU
*(u32 *)FALCON_CPUCTL = 0x02;
// Infinite loop
deadlock();
</syntaxhighlight>
</syntaxhighlight>


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  // Clear the PK11 blob from memory
  // Clear the PK11 blob from memory
  clear_pk11_blob();
  clear_pk11_blob();
u32 FLOW_CTLR_HALT_COP_EVENTS = 0x60007004;
u32 FLOW_MODE_STOP = 0x40000000;
u32 HALT_COP_EVENT_JTAG = 0x10000000;
   
   
  // Halt the boot processor
  // Halt the boot processor
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After disabling fuse programming, the bootloader configures the EMC and MEM/MC. It additionally disables QSPI resets and programs a special aperture designed for AHB redirected access to IRAM.
After disabling fuse programming, the bootloader configures the EMC and MEM/MC. It additionally disables QSPI resets and programs a special aperture designed for AHB redirected access to IRAM.


<syntaxhighlight lang="c">
<syntaxhighlight lang="c">  
u32 PERIPH_CLK_SOURCE_EMC = 0x6000619C;
u32 CLK_OUT_ENB_SET_H = 0x60006328;
u32 CLK_OUT_ENB_SET_X = 0x60006284;
u32 RST_DEVICES_SET_H = 0x60006308;
u32 RST_DEVICES_CLR_Y = 0x600062AC;
u32 MC_IRAM_REG_CTRL = 0x70019964;
u32 MC_IRAM_BOM = 0x7001965C;
u32 MC_IRAM_TOM = 0x70019660;
  // Initialize EMC's clock source
  // Initialize EMC's clock source
  u32 emc_clk_src_val = *(u32 *)PERIPH_CLK_SOURCE_EMC;
  u32 emc_clk_src_val = *(u32 *)PERIPH_CLK_SOURCE_EMC;
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After the security engine is ready and before decrypting the next stage, the bootloader initializes and generates several keys into hardware keyslots.
After the security engine is ready and before decrypting the next stage, the bootloader initializes and generates several keys into hardware keyslots.
For more details on the Switch's cryptosystem, please see [[Cryptosystem|this page]].
For more details on the Switch's cryptosystem, please see [[Cryptosystem|this page]].
[6.2.0+] The key generation process was moved into an encrypted [[TSEC]] payload.


===== Selection =====
===== Selection =====
Retrieved from "https://switchbrew.org/wiki/Package1"