Macbook Pro A1398 EMC 2190 No Write protect pin

Hi. I need help from you guys. I need to read, modify and write eeprom MX25L6473E from macbook a1398 but in datasheet, there is no WP# and Hold# pin? Is there any way to read this eeprom with flashrom (raspberry pi)?

Please help. Don't know what to do

Thank you

I assume you mean emc 2910. 2190 is the old school iPhone dock (-:

These chips are quad enabled.

Try just with vcc, gnd, cs, si, so, clk with various battery/MagSafe conditions.

No joy?

Remove vcc pin and power on mac to EFI lock screen or OS X lock screen and try again.

reverendalc wrote: I assume you mean emc 2910. 2190 is the old school iPhone dock (-:

These chips are quad enabled.

Try just with vcc, gnd, cs, si, so, clk with various battery/MagSafe conditions.

No joy?

Remove vcc pin and power on mac to EFI lock screen or OS X lock screen and try again.

reverendalc thank you for fast reply.
Yes, sorry it is emc 2910. How do you mean various battery/MagSafe conditions? To read eeprom while it is still on board and powered on?

first, with VCC pin connected to programmer:

try with battery+magsafe, battery only, magsafe only, and neither.

if none of those work, REMOVE VCC pin (leave GND) and try:

MacBook powered on to EFI lock screen, lid closed
MacBook powered on to OS X lock screen, lid closed
remove SSD and power on to [?] screen, lid closed

these newer EFI chips with quad mode, they can be more difficult to write to.
often the read is easy, but without holding the WP and HOLD lines, it often comes down to powering on the mac to a state where the chip is not locked and WREN is set.

it's entirely possible, just requires some trial and error.

there's a sticky titled PLEASE POST YOUR SUCCESSFUL FLASH ENVIRONMENTS HERE

i would appreciate it if you post what works for you there, to help others with their journey.

I have truble even at reading chip. I have connected vcc, gnd, cs, si, so, clk but flashrom cannot detect eeprom? What m'i doing wrong? I have tried w/o battery, w/o magsafe, w/o vcc but flashrom can't detect chip.

I have seen in another post user ChomsMaster wrote this:
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

Can someone explain this. Does this mean that pin WP is the same as IO2 and pin HOLD is the same as IO3? I'm confused

often times that is correct.

i don't see anything in this particular data sheet, but..
if you look at this data sheet for a similar winbond chip:



you'll see that in single SPI mode uses the pins differently than dual/quad SPI mode.

reverendalc wrote: often times that is correct.

i don't see anything in this particular data sheet, but..
if you look at this data sheet for a similar winbond chip:

you'll see that in single SPI mode uses the pins differently than dual/quad SPI mode.

I haved tried to connect without pin 3 and pin 7 but no luck. Cant read chip!? Dont know why

I check with mulitmeter and when macbook is in a sleep and powered with magsafe it gets power on vcc pin. So I have tried to connect on raspberry only pin 1 cs#, pin2 so/miso, pin6 sclk, and pin5 si/mosi but again flashrom cant find chip? Is there any special way to read this quad enabled chips or what?

Success It's so easy. I posted tutorial in thread POST YOUR SUCCESSFUL FLASH ENVIRONMENTS HERE!

glad you got it sorted out