2.4.21-rc boot stalls

Hi. I just built 2.4.21-rc. It hangs on boot. More specifically, I get:
hda: (ide_dma_test_irq) called while not waiting
blk queue c031e840
I/O limit 4095 Mb (mask 0xffffffff)
setting using_dma_to 1 (on)

... It gets here and stalls. No OOPS. My ide devices are:
cat /proc/ide/hda/model
Maxtor 92041U4
cat /proc/ide/hdb/model
Maxtor 98196H8
cat /proc/ide/hdc/model
SAMSUNG DVD-ROM SD-608
cat /proc/ide/hdd/model
CR-4804TE

My chipset is:
cat /proc/ide/sis
SiS 5513 Ultra 100 chipset
--------------- Primary Channel ---------------- Secondary Channel
-------------Channel Status: On On

Operation Mode: Compatible 	 	 	 Compatible 
Cable Type:     80 pins 	 	 	 80 pins
Prefetch Count: 512 	 	 	 	 512
Drive 0:        Postwrite Enabled 	 	 Postwrite Disabled

Prefetch Enabled Prefetch Disabled
UDMA Enabled UDMA Disabled
UDMA Cycle Time 3 CLK UDMA Cycle Time Reserved
Data Active Time 3 PCICLK Data Active Time 3
PCICLK
Data Recovery Time 1 PCICLK Data Recovery Time 1
PCICLK
Drive 1: Postwrite Enabled Postwrite Disabled
Prefetch Enabled Prefetch Disabled
UDMA Enabled UDMA Disabled
UDMA Cycle Time 2 CLK UDMA Cycle Time Reserved
Data Active Time 3 PCICLK Data Active Time 3
PCICLK
Data Recovery Time 1 PCICLK Data Recovery Time 3
PCICLK

I checked /Documentation/Changes and confirmed that all of my build software meets/exceeds the minimum requirements, but be aware I am using gcc 3.2.2 and glibc-2.3.1. I also use hdparm to set multi-word 32 bit I/O with DMA (hdparm -d1 -c3 -m16 -k1) at boot time. (Also, 2.4.21-pre6 builds/boots/runs OK).

Thanks in advance,

Bob

Do you have APIC support or ACPI enabled ?

(from the build script)
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_UP_APIC=y
CONFIG_X86_UP_IOAPIC=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y

# CONFIG_HOTPLUG_PCI_ACPI is not set
# CONFIG_ACPI is not set

My motherboard has the SiS645 chipset.
The SiS961 is the I/O APIC (ACPI 1.0b and APM 1.2 Compliant).

Currently my BIOS ACPI is set to suspend to standby (but I don't use it and so haven't configured it in the kernel).

I will rebuild the kernel with ACPI support and let you know the results (later today...after sleep).

Thanks for your reply,

Bob

SiS APIC's are only supported in 2.5.x