Need help with MacBook 12

ChomsMaster wrote: This is process complete for unlock efi in MacBook 12 A1534 EMC 2746 Mother Board 820-00045,

For example:
Compare the scheme of a retina 13 with MacBook 12, result:

PIN's of Chip EFI:
1 <-- SPI_MLB_CS_L = SPI_ALT_CS_L --> 5
2 <-- SPI_MLB_MISO = SPI_ALT_MISO --> 6
3 <-- SPI_WP_L = SPI_ALT_IO<2> --> 8
4 <-- VSS = 16
5 <-- SPI_MLB_MOSI = SPI_ALT_MOSI --> 4
6 <-- SPI_MLB_CLK = SPI_ALT_CLK --> 3
7 <-- PIROM_USE_MLB = SPI_ALT_IO<3> --> 10
8 <-- VDD = PP3V3_S5

For more details see pictures,

Best Regards,

Oscar Salcedo

ChomsMaster, can you plese help me. On my chip I don't have WP# and HOLD# instead I have SIO2 and SIO3. How to connect this efi chip to raspberry. Sorry for bothering you here but I really need help. I have tried without connecting raspberry to pin3 and pin7 but flashrom cannot detect my chip

i have created a new thread for you.

the previous thread is for successful flash environments only

thank you

Hi esko1, WP # corresponds to SIO2 and HOLD is the same SIO3, in the schematic the descriptions are:

SIO2 => W * => VPP => DQ2 => WP => IO2
SIO3 => HOLD * => DQ3 => IO3

This means that the connections are exactly the same as I explain,

Best Regards!