mirrors/qemu
0
0
Fork 0
mirror of https://github.com/qemu/qemu.git synced 2024-12-15 23:43:31 +08:00
Code Issues Packages Projects Releases Wiki Activity

hw/nvram/eeprom_at24c: Make reset behavior more like hardware

Browse Source 
EEPROM's are a form of non-volatile memory. After power-cycling an EEPROM,
I would expect the I2C state machine to be reset to default values, but I
wouldn't really expect the memory to change at all.

The current implementation of the at24c EEPROM resets its internal memory on
reset. This matches the specification in docs/devel/reset.rst:

  Cold reset is supported by every resettable object. In QEMU, it means we reset
  to the initial state corresponding to the start of QEMU; this might differ
  from what is a real hardware cold reset. It differs from other resets (like
  warm or bus resets) which may keep certain parts untouched.

But differs from my intuition. For example, if someone writes some information
to an EEPROM, then AC power cycles their board, they would expect the EEPROM to
retain that information. It's very useful to be able to test things like this
in QEMU as well, to verify software instrumentation like determining the cause
of a reboot.

Fixes: 5d8424dbd3 ("nvram: add AT24Cx i2c eeprom")
Signed-off-by: Peter Delevoryas <peter@pjd.dev>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Corey Minyard <cminyard@mvista.com>
Link: https://lore.kernel.org/r/20230128060543.95582-6-peter@pjd.dev
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Peter Delevoryas 2023-02-07 09:02:05 +01:00 committed by Cédric Le Goater
parent c0216b94ed
commit 4f2c6448c3
1 changed files with 10 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
hw/nvram/eeprom_at24c.c
View File

@ -184,18 +184,6 @@ static void at24c_eeprom_realize(DeviceState *dev, Error **errp)
}
ee->mem = g_malloc0(ee->rsize);
}
static
void at24c_eeprom_reset(DeviceState *state)
{
EEPROMState *ee = AT24C_EE(state);
ee->changed = false;
ee->cur = 0;
ee->haveaddr = 0;
memset(ee->mem, 0, ee->rsize);
if (ee->init_rom) {
@ -213,6 +201,16 @@ void at24c_eeprom_reset(DeviceState *state)
}
}
static
void at24c_eeprom_reset(DeviceState *state)
{
EEPROMState *ee = AT24C_EE(state);
ee->changed = false;
ee->cur = 0;
ee->haveaddr = 0;
}
static Property at24c_eeprom_props[] = {
DEFINE_PROP_UINT32("rom-size", EEPROMState, rsize, 0),
DEFINE_PROP_BOOL("writable", EEPROMState, writable, true),