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This is Kevin's original message; forwarded here with his permission... -------- Original Message -------- Subject: SysLinux Bug Date: Tue, 22 Oct 2002 10:27:36 -0700 From: ktran at broadcom.com To: hpa at zytor.com CC: Kevin Tran <ktran at broadcom.com> Hi Peter, My name is Kevin Tran and I am a software developer at Broadcom Corporation. Some of our customers found a problem where SysLinux locks up when it tries to boot/install from the network via our PXE code....

Hi Peter, I traced over these routines you suggested briefly and I didn't see where it invokes PXE UNDI_API (PXENV_UNDI_SHUTDOWN(0x5) to shut down the device. When this is invoked, my UNDI driver will put the device into an inactive state so that it doesn't do any more DMA read/write over PCIe bus anymore. What am I missing? Thanks! Kevin -----Original Message----- From: H. Peter

Hi Peter, They use PXELINUX to download the OS deployment bootstrap. When this is completed, they want to shutdown the stack including the UNDI driver before jumping to the kernel. Thanks! Kevin On Feb 12, 2014, at 8:15 PM, "H. Peter Anvin" <hpa at zytor.com> wrote: > On 02/12/2014 05:37 PM, Kevin Tran wrote: > Hi, > One of our customers uses INT 22h/AX=C to shut down

Hi, One of our customers uses INT 22h/AX=C to shut down UNDI interface. This interface is documented in http://www.syslinux.org/doc/comboot.txt. The excerpt is shown below: AX=000Ch [2.00] Perform final cleanup Input: AX 000Ch DX derivative-specific flags (0000h = clean up all) Output: None Apparently, device is not shut down based on the description of