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TegraExplorer
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Update loader

This commit is contained in:
suchmememanyskill 2021-09-15 21:22:35 +02:00
parent 80d6ad6a00
commit 11c69d4cb1
3 changed files with 17 additions and 12 deletions
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5
loader/Makefile
View File

@ -27,8 +27,11 @@ OBJS = $(addprefix $(BUILDDIR)/$(TARGET)/, \
CUSTOMDEFINES := -DBL_MAGIC=$(IPL_MAGIC)
CUSTOMDEFINES += -DBL_VER_MJ=$(BLVERSION_MAJOR) -DBL_VER_MN=$(BLVERSION_MINOR) -DBL_VER_HF=$(BLVERSION_HOTFX) -DBL_RESERVED=$(BLVERSION_RSVD)
#TODO: Considering reinstating some of these when pointer warnings have been fixed.
WARNINGS := -Wall -Wno-array-bounds -Wno-stringop-overflow
ARCH := -march=armv4t -mtune=arm7tdmi -mthumb-interwork
CFLAGS = $(ARCH) -O2 -g -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -std=gnu11 -Wall $(CUSTOMDEFINES)
CFLAGS = $(ARCH) -O2 -g -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -std=gnu11 $(WARNINGS) $(CUSTOMDEFINES)
LDFLAGS = $(ARCH) -nostartfiles -lgcc -Wl,--nmagic,--gc-sections -Xlinker --defsym=LDR_LOAD_ADDR=$(LDR_LOAD_ADDR)
################################################################################

2
loader/link.ld
View File

@ -5,7 +5,7 @@ SECTIONS {
. = __ipl_start;
.text : {
*(.text._start);
*(._boot_cfg);
KEEP(*(._boot_cfg));
*(.text*);
}
.data : {

22
loader/loader.c
View File

@ -33,9 +33,6 @@ boot_cfg_t __attribute__((section ("._boot_cfg"))) b_cfg;
void loader_main()
{
// Preserve sections.
__asm__ ("" : : "" (b_cfg));
// Preliminary BPMP clocks init.
CLOCK(CLK_RST_CONTROLLER_CLK_SYSTEM_RATE) = 0x10; // Set HCLK div to 2 and PCLK div to 1.
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_SYS) = 0; // Set SCLK div to 1.
@ -45,7 +42,8 @@ void loader_main()
CLOCK(CLK_RST_CONTROLLER_SCLK_BURST_POLICY) = 0x20003333; // Set SCLK to PLLP_OUT (408MHz).
// Get Loader and Payload size.
u32 payload_size = sizeof(payload_00) + sizeof(payload_01);
u32 payload_size = sizeof(payload_00) + sizeof(payload_01); // Actual payload size.
payload_size += (u32)payload_01 - (u32)payload_00 - sizeof(payload_00); // Add array alignment.
u32 *payload_addr = (u32 *)payload_00;
// Relocate payload to a safer place.
@ -60,16 +58,20 @@ void loader_main()
bytes--;
}
// Uncompress payload parts.
// Set source address of the first part.
u8 *src_addr = (void *)(IPL_RELOC_TOP - ALIGN(payload_size, 4));
u32 pos = LZ_Uncompress((const u8 *)src_addr, (u8*)IPL_LOAD_ADDR, sizeof(payload_00));
src_addr += (u32)payload_01 - (u32)payload_00;
LZ_Uncompress((const u8 *)src_addr, (u8*)IPL_LOAD_ADDR + pos, sizeof(payload_01));
// Uncompress first part.
u32 dst_pos = LZ_Uncompress((const u8 *)src_addr, (u8*)IPL_LOAD_ADDR, sizeof(payload_00));
// Copy over boot configuration storage in case it was set.
// Set source address of the second part. Includes array alignment.
src_addr += (u32)payload_01 - (u32)payload_00;
// Uncompress second part.
LZ_Uncompress((const u8 *)src_addr, (u8*)IPL_LOAD_ADDR + dst_pos, sizeof(payload_01));
// Copy over boot configuration storage.
memcpy((u8 *)(IPL_LOAD_ADDR + IPL_PATCHED_RELOC_SZ), &b_cfg, sizeof(boot_cfg_t));
// Chainload.
// Chainload into uncompressed payload.
void (*ipl_ptr)() = (void *)IPL_LOAD_ADDR;
(*ipl_ptr)();