Issue #554 has been updated by Matt DeVillier.
Status changed from New to Rejected
This completely messes up the bios chips' firmware tabling, making it impossible to internally or externally flash (while the chips were still on the motherboard). You cannot read or write from either of the chips, and the 8MB chip thinks it 4MB.
I'm not sure what you did, but the instructions you followed would not do what you claimed. Changing the IFD so that only the 8MB chip is used cannot possibly affect the ability to flash the chip externally. External flashing doesn't care about or even read the IFD (unless you use the `--ifd -i xxx` param).
Some boards with multiple chips share a CS line and need extra care to ensure that you're reading from the correct one, and that sounds like what you ran into -- nothing to do with changing the IFD.
---------------------------------------- Other #554: Do not follow ch1p's guide on flashing Thinkpad W530 with only 8MB chip!! https://ticket.coreboot.org/issues/554#change-1898
* Author: Simon Dominic * Status: Rejected * Priority: Normal * Target version: none * Start date: 2024-08-23 ---------------------------------------- I had to learn this the hard way and (literally) pay the price (for it to be repaired) for following this guide (both on their own [website](https://ch1p.io/coreboot-t530-one-chip/) and a [reddit post](https://www.reddit.com/r/coreboot/comments/956ymu/howto_flash_coreboot_on_x2...)). I often make tweaks to my coreboot config which often breaks my system by not being able to boot, and thus requires a fully disassembly to access the 4MB chip to externally flash. As you can imagine, doing this every time I mess up is annoying, and so the idea that I could do it with just the 8MB chip, which is easily accessible, was very attractive.
Right off the bat, I'll say this this method causes so many problems and going through the pain and frustration is not worth the convenience of not doing full disassembly. I was in contact with ch1p who was very helpful in trying to help me out. However, it must be said that this guide should **NOT** be followed!
This completely messes up the bios chips' firmware tabling, making it impossible to internally or externally flash (while the chips were still on the motherboard). You cannot read or write from either of the chips, and the 8MB chip thinks it 4MB.
I would get errors like this: ``` Reading old flash chip contents... done. Erasing and writing flash chip... FAILED at 0x00000000! Expected=0xff, Found=0x16, failed byte count from 0x00000000-0x00000fff: 0x1000 ERASE FAILED! Reading current flash chip contents... done. Looking for another erase function. FAILED at 0x00000000! Expected=0xff, Found=0x16, failed byte count from 0x00000000-0x0000ffff: 0x10000 ERASE FAILED! Reading current flash chip contents... done. Looking for another erase function. FAILED at 0x00000000! Expected=0xff, Found=0x16, failed byte count from 0x00000000-0x0000ffff: 0x10000 ERASE FAILED! Reading current flash chip contents... done. Looking for another erase function. FAILED at 0x00000000! Expected=0xff, Found=0x16, failed byte count from 0x00000000-0x003fffff: 0x400000 ERASE FAILED! Reading current flash chip contents... done. Looking for another erase function. FAILED at 0x00000000! Expected=0xff, Found=0x16, failed byte count from 0x00000000-0x003fffff: 0x400000 ERASE FAILED! Reading current flash chip contents... done. Looking for another erase function. Looking for another erase function. Looking for another erase function. No usable erase functions left. FAILED! Uh oh. Erase/write failed. Checking if anything has changed. Reading current flash chip contents... done. Apparently at least some data has changed. Your flash chip is in an unknown state. Please report this to the mailing list at flashrom@flashrom.org or on IRC (see https://www.flashrom.org/Contact for details), thanks! ```
Thanks to [this](https://github.com/flashrom/flashrom/issues/190) github issue, I figured the only way to fix this was to have the chips physically removed and then flash them. Since I can't solder, I paid someone to do it (they charge for disassembly, so saved by dissembling myself and giving them just the motherboard).
The bad news is the 8MB always thinks it's 4MB, so impossible to externally flash that chip. The good news is the 4MB chip is perfectly fine, which is great because that's the chip for the actually bios. From there, you can internally flash (both chips), so that problem sorts itself out.
I had to pay someone to fix the mess that the guide caused. If someone with a Thinkpad W530 happens to stumble upon this post, you will save yourself time, pain and money by ignoring the guide and just dealing with full disassembly. It's not worth it.