What tool to install the setup on usb should i use? And how can i check if the driver is integrated in the winxp setup?

For the device 0f23 i found some files that may be relevant to this: VLV2AHCI.inf and VLV2AHCI.cat
I downloaded it from here:
Also here is a previous version: http://www.magicdriver.com/hardware_id=P...N_8086&DEV_0F23
I may give you some hints.

Edit: more drivers: https://downloadmirror.intel.com/15251/eng

With Nlite I Choose single driver, but then it shows the complete list in the folder. This is a bit strange. I choosed only baytrail...

I used Rufus 2.2.668 with mbr partitionschema and NTFS but it gave me some problems. There was no message for safe removal after ejecting.

With WinSetupFromUSB-1-6-beta2 i could boot from USB but After hitting F5 and "Windows is started" there is only a blinking cursor left and nothing is happening.

Oh wait, after quite a few minutes there comes the 7B again...

Hi Fernando, I've spent hours on this problem and your excellent forum is my last hope before I return my notebook. It is the Lenovo S21e, with Bay Trail socket 1170 chipset, N2850 celeron CPU and Insyde BIOS. There seems to be absolutely no way for me to get XP installed to the system due to BIOS limitations. It seems also that the BIOS is SPI locked, although there have been two versions, 1.04 and 1.05 of the BIOS released to date. With Lenovo's utility, I can flash or backflash from 1.05 to 1.04 or vice versa There doesn't seem to be any AHCI driver at all listed in Win 8.1, which came preinstalled on the system. I've tried the following:

1. Default XP install fails with 0xA5 error. Pressing F7 to bypass ACPI results in 0x7b error of course.
2. Slipstreamed your latest intel AHCI / SATA drivers in textmode, same, the SSD is not detected and BSOD 0x7b results.

I saw in other post on Bay Trail chipset that there doesn't appear to be any SATA or AHCI drivers for this chipset because it's a socket on a chip. So, Win 8.1 is using a fake / placeholder AHCI driver, and I downloaded and slipstreamed your modified "Bay trail" drivers with no result?

Is there any hope of getting XP on it to save approx. 10 GB of space on the measly 32 GB SSD drive? I guess Lenovo intentionally cripples the system to not allow any other Microsoft OS other than Win 8 / 8.1. Should I return the system?

If we kann activate IDE mode, then it might be possible to install xp.
I read a lot and tried something that diddt work. Now its 2:34am and im going to sleep.
Good Night ;-)

SUCCESS !! Used setup_var 0x39 0x0 to activate IDE ! (USE AT YOUR OWN RISK)
With this bootx64.efi: https://dl.dropboxusercontent.com/u/9950...0_EFI_Shell.zip
Refer to Internet about the other steps. Other BOOTX64.efi than the link above did not work for me!

It is a Lenovo S21e.

Uploaded it so there would not be a 404 dissapoinment!

Damn it, i didnt get very far! The internal sd-card is not detected in winxp installationmenü. I only see usb stick, and at least one diddnt work to install xp on it!
Also external sdcard is not detected.

I just found, that with my new laptop (Acer apsire es1-111) there is a sata ahci controller that has the same vendor and device id as the sd hostcontroller in my lenovo s21e. Also on the acer there is a intel sdhostcontroller dev 0f14 and sda standard conform sd-hostcontroller dev 0f16. they both use the files dumpsd.sys and sdbus.sys. The sata ahci controller uses storahci.sys.
The more i find out the more confused i get...