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Updates to DRAM controllers to avoid use of SMBus Quick Write and add fallback paths if SMBus Block Write is unavailable, in preparation for X299 SMBus support

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This commit is contained in:
Adam Honse
2026-06-14 16:52:20 -05:00
parent ed8fd91192
commit e79af523c0
9 changed files with 107 additions and 58 deletions
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14
SPDAccessor/DDR4DirectAccessor.cpp
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@@ -23,27 +23,17 @@ DDR4DirectAccessor::~DDR4DirectAccessor()
bool DDR4DirectAccessor::isAvailable(i2c_smbus_interface *bus, uint8_t spd_addr)
{
/*-----------------------------------------------------*\
| Perform i2c quick transfer to test if i2c address |
| responds |
\*-----------------------------------------------------*/
int value = bus->i2c_smbus_write_quick(0x36, 0x00);
if(value < 0)
{
return false;
}
/*-----------------------------------------------------*\
| Select low page |
\*-----------------------------------------------------*/
bus->i2c_smbus_write_byte_data(0x36, 0x00, 0xFF);
bus->i2c_smbus_write_byte(0x36, 0x00);
std::this_thread::sleep_for(SPD_IO_DELAY);
/*-----------------------------------------------------*\
| Read value at address 0 in SPD device |
\*-----------------------------------------------------*/
value = bus->i2c_smbus_read_byte_data(spd_addr, 0x00);
s32 value = bus->i2c_smbus_read_byte_data(spd_addr, 0x00);
/*-----------------------------------------------------*\
| DDR4 is available if value is 0x23 |