This adds the MPAGE (sdcc _XPAGE) SFR, which is used by sdcc in `--xstack`
mode to provide the upper byte of the address for `MOVX A, @Ri` and
`MOVX @Ri, A` instructions.
Classic 8051 uses the P2 SFR value for this, but the RTL IP block does not
seem to be using the "Port 2 module".
From the databook:
```
To replace the function of the Port 2 latch in designs that do not use a
Port 2 module, the DW8051 provides an additional special function register,
MPAGE, at SFR address 92h. During MOVX A, @Ri and MOVX @Ri, A instructions,
the DW8051 places the contents of the MPAGE register on the upper 8 address
bits (mem_addr[15:8]). This provides the paging function that is normally
provided by the Port 2 latch. The MPAGE register has no function when a
Port 2 module is used to connect external RAM.
```
The SWTG018AS-A V2.0 is an 8x2.5GBit/s port + 1 SFP+ port unmanged device
It is sold in an unbranded casing e.g. by Ampcom.
Hardware:
SoC: RTL8373N
Additional PHY: RTL8224
Flash: Puya P25D40SH (4MBit, slimmer, not standard SOP-8 package!)
LEDs: 1 Green + 1 Orange per Ethernet port (green designates 2.5GBit)
1 Green LED for the SFP+ port
The photos already show a modified PCB: Unpopulated resistors R52 and R53
have been bridged in order to enable the serial console. The smaller flash
memory chip at U2 has been replaced with a Windbond 128MBit standard-sized
SOIC-8 chip in order to easily use SOIC clamps to flash the device. Also
the serial header has been populated.
The current code for entering commands via the serial CLI is completely
refactored and moved out of rtlplayground.c into a separate file cmd_edit.c
putting code into BANK2.
The serial ring buffer sbuf[] is now exclusively used for receiving
keys, including escape sequences (DEL will generate a 4-byte escape
sequence). The command is now held in cmd_buffer. This reduces
XMEM use, because the serial buffer can be much smaller.
Supported is only editing the current command line via backspace, del,
cursor left and right.
Because the code cannot distinguish escape sequences which are not yet
complete (because the serial isr has not yet put all characters into
the serial buffer) from the dozens of unsupported ones (F-keys/home,
Page up/down, cursor up/down...) they are ignored and remain in the
serial buffer until the ring-pointer overwrites them. This is standard
behaviour for consoles, which will print out garbage for unsupported
characters. In this implementation, the command line buffer and the
visible command line in the terminal are always synced, so garbage
can be removed again by ediing the line.
The code makes several redundant checks in order to prevent race-conditions
between the serial ISR and the comand-editing code.
PR #119 made that no machine-type is selected, so the build will fail.
commit 2f787fee enables us select a machine via a variable, use this to
select a machine-type `KP_9000_6XHML_X2` to build.
The left and right SFP ports were swapped in the machine structure. They
are now correctly identified a comment is added. The custo LED-mux
is removed again, as this was accidentally added for demonstration
purposes. It is not necessary, as the device uses the default.
Tobias Diedrich
feelfree69
logicog
René van Dorst
logicog
feelfree69
MaDill
chriz
TylerDurden-23