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q800: add a block backend to the PRAM

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This allows to save and restore the content of the PRAM.
It may be useful if we want to check the configuration or to change it.

The backend is added using mtd interface, for instance:

    ... -drive file=pram.img,format=raw,if=mtd ...

where pram.img is the file where the data will be stored, its size must
be 256 bytes.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20191219201439.84804-3-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2019-12-19 21:14:39 +01:00
parent b2619c158a
commit eb064db94c
3 changed files with 74 additions and 0 deletions
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3
include/hw/misc/mac_via.h
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@ -81,6 +81,8 @@ typedef struct MOS6522Q800VIA2State {
typedef struct MacVIAState {
SysBusDevice busdev;
VMChangeStateEntry *vmstate;
/* MMIO */
MemoryRegion mmio;
MemoryRegion via1mem;
@ -100,6 +102,7 @@ typedef struct MacVIAState {
uint8_t cmd;
int wprotect;
int alt;
BlockBackend *blk;
/* ADB */
ADBBusState adb_bus;