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Fix hb autoboot stuck in exception at boot after a forced shutdown

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Closes #1882.

Whenever power button is held long enough ("force shutdown"), mcu sysmodule
stores a flag in free reg 0. It will clear it next boot.

During that next boot, if that flag was set and if CFG_BOOTENV.bit0 is set
(warmboot/firm chainload, i.e. not coldbooting), then main() will simulate
a "power button held" interrupt (after upgrading mcu fw if necessary -- it
will reboot console after if it has upgraded mcu fw, I guess that's one of
the reasons the flag is there). This obviously cause other processes to initiate
a shutdown.

In the case of autoboot, ns will panic when this happens.
This commit is contained in:
TuxSH 2024-06-12 22:44:38 +02:00
parent 725823a9d9
commit cc46e16d66
1 changed files with 21 additions and 0 deletions
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21
arm9/source/deliver_arg.c
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@ -29,6 +29,7 @@
#include "memory.h"
#include "config.h"
#include "fs.h"
#include "i2c.h"
u8 *loadDeliverArg(void)
{
@ -151,6 +152,26 @@ static bool configureHomebrewAutobootCtr(u8 *deliverArg)
// Tell NS to run the title, and that it's not a title jump from legacy mode
*(u32 *)(deliverArg + 0x460) = (0 << 1) | (1 << 0);
// Whenever power button is held long enough ("force shutdown"), mcu sysmodule
// stores a flag in free reg 0. It will clear it next boot.
// During that next boot, if that flag was set and if CFG_BOOTENV.bit0 is set
// (warmboot/firm chainload, i.e. not coldbooting), then main() will simulate
// a "power button held" interrupt (after upgrading mcu fw if necessary -- it
// will reboot console after if it has upgraded mcu fw, I guess that's one of
// the reasons the flag is there). This obviously cause other processes to initiate
// a shutdown, and it also sets that flag again.
// In the case of autoboot, ns will panic when this happens. This caused
// hb autoboot to keep failing over and over again.
// Select free reg 0, read it, select it again, write it (clearing force shutdown flag)
I2C_writeReg(I2C_DEV_MCU, 0x60, 0);
u8 flags = I2C_readReg(I2C_DEV_MCU, 0x61);
flags &= ~4;
I2C_writeReg(I2C_DEV_MCU, 0x60, 0);
I2C_writeReg(I2C_DEV_MCU, 0x61, flags);
CFG_BOOTENV = 1;
return true;