gistfile1.txt

This is what I get right after boot:
```
~$ sudo cat /sys/kernel/debug/20980000.usb/fifo
Non-periodic FIFOs:
RXFIFO: Size 4096
NPTXFIFO: Size 32, Start 0x00200000

Periodic TXFIFOs:
        DPTXFIFO 1: Size 512, Start 0x00001020
        DPTXFIFO 2: Size 512, Start 0x00001220
        DPTXFIFO 3: Size 512, Start 0x00001420
        DPTXFIFO 4: Size 512, Start 0x00001620
        DPTXFIFO 5: Size 512, Start 0x00001820
        DPTXFIFO 6: Size 768, Start 0x00001a20
        DPTXFIFO 7: Size 768, Start 0x00001d20
```

Connect keyboard:
```
~$ sudo cat /sys/kernel/debug/20980000.usb/fifo
Non-periodic FIFOs:
RXFIFO: Size 774
NPTXFIFO: Size 256, Start 0x01000000

Periodic TXFIFOs:
        DPTXFIFO 1: Size 512, Start 0x00000406
        DPTXFIFO 2: Size 512, Start 0x00000406
        DPTXFIFO 3: Size 512, Start 0x00000406
        DPTXFIFO 4: Size 512, Start 0x00000406
        DPTXFIFO 5: Size 512, Start 0x00000406
        DPTXFIFO 6: Size 512, Start 0x00000406
        DPTXFIFO 7: Size 512, Start 0x00000406
```

Disconnect keyboard:
```
~$ sudo cat /sys/kernel/debug/20980000.usb/fifo
Non-periodic FIFOs:
RXFIFO: Size 256
NPTXFIFO: Size 32, Start 0x00200000

Periodic TXFIFOs:
        DPTXFIFO 1: Size 256, Start 0x00000120
        DPTXFIFO 2: Size 128, Start 0x00000220
        DPTXFIFO 3: Size 128, Start 0x000002a0
        DPTXFIFO 4: Size 64, Start 0x00000320
        DPTXFIFO 5: Size 64, Start 0x00000360
        DPTXFIFO 6: Size 64, Start 0x000003a0
        DPTXFIFO 7: Size 32, Start 0x000003e0
```

Reboot
```
~$ sudo cat /sys/kernel/debug/20980000.usb/fifo
Non-periodic FIFOs:
RXFIFO: Size 4096
NPTXFIFO: Size 32, Start 0x00200000

Periodic TXFIFOs:
        DPTXFIFO 1: Size 512, Start 0x00001020
        DPTXFIFO 2: Size 512, Start 0x00001220
        DPTXFIFO 3: Size 512, Start 0x00001420
        DPTXFIFO 4: Size 512, Start 0x00001620
        DPTXFIFO 5: Size 512, Start 0x00001820
        DPTXFIFO 6: Size 768, Start 0x00001a20
        DPTXFIFO 7: Size 768, Start 0x00001d20
```

Load g_serial
```
~$ sudo cat /sys/kernel/debug/20980000.usb/fifo
Non-periodic FIFOs:
RXFIFO: Size 256
NPTXFIFO: Size 32, Start 0x00200000

Periodic TXFIFOs:
        DPTXFIFO 1: Size 256, Start 0x00000120
        DPTXFIFO 2: Size 128, Start 0x00000220
        DPTXFIFO 3: Size 128, Start 0x000002a0
        DPTXFIFO 4: Size 64, Start 0x00000320
        DPTXFIFO 5: Size 64, Start 0x00000360
        DPTXFIFO 6: Size 64, Start 0x000003a0
        DPTXFIFO 7: Size 32, Start 0x000003e0
```

---------------------------------------------------------------------

Using the txfifo patch without any fifo DT properties gives address values that doesn't add up. I think we would get a WARNING if it wasn't dropped in the ptch.
https://www.spinics.net/lists/linux-usb/msg134539.html
~$ sudo cat /sys/kernel/debug/20980000.usb/fifo
Non-periodic FIFOs:
RXFIFO: Size 2048
NPTXFIFO: Size 1024, Start 0x04000000

Periodic TXFIFOs:
        DPTXFIFO 1: Size 512, Start 0x00000c00
        DPTXFIFO 2: Size 512, Start 0x00001220
        DPTXFIFO 3: Size 512, Start 0x00001420
        DPTXFIFO 4: Size 512, Start 0x00001620
        DPTXFIFO 5: Size 512, Start 0x00001820
        DPTXFIFO 6: Size 768, Start 0x00001a20
        DPTXFIFO 7: Size 768, Start 0x00001d20