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core: T1 port can run on T1 bootloader with MEMORY_PROTECT=0

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Ondrej Mikle 2020-05-21 08:49:59 +02:00
parent a2f790167d
commit 0d65d684f0
1 changed files with 8 additions and 0 deletions
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8
core/embed/firmware/startup.s
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@ -6,7 +6,15 @@
.type reset_handler, STT_FUNC
reset_handler:
// The following loading of VTOR address only works if T1 bootloader was built with MEMORY_PROTECT=0
// or the firmware was properly signed. All other variants end up in hard fault due to MPU
// (cf mpu_config_firmware in legacy bootloader)
#if TREZOR_MODEL == 1
ldr r0, =0xE000ED08 // r0 = VTOR address
ldr r1, =0x08010400 // r1 = FLASH_APP_START
str r1, [r0] // assign
ldr r0, =_estack - 8 // r0 = stack pointer, T1 bootloader had 8 bytes reserved at end
msr msp, r0 // set stack pointer
dsb