On Tue, 20 Nov 2018 00:04:03 +0200, Ranran said: > That's interesting... > I think the name is confusing, because this chips are also writable. > > Not only this, but in arm the eeprom (at24) is writable! > But in the x86 I am using, it is readonly in kernel code: > https://android.googlesource.com/kernel/omap/+/glass-omap-xrr02/drivers/misc/eeprom/eeprom.c > static struct bin_attribute eeprom_attr = { > .attr = { > .name = "eeprom", > .mode = S_IRUGO, > }, > .size = EEPROM_SIZE, > .read = eeprom_read, > };
Well, at least in the mainline kernel, we have this at the top of the eeprom.c
file:
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x50, 0x51, 0x52, 0x53, 0x54,
0x55, 0x56, 0x57, I2C_CLIENT_END };
/* Size of EEPROM in bytes */
#define EEPROM_SIZE 256
which is pretty obviously intended for "very small eeprom hanging off an I2C
adapter",
and thus probably *NOT* the boot ROM that the BIOS lives in.
pgpuBwbSJesU6.pgp
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