I have device with embedded eCos RTOS and SPI Flash memory, 8MB NOR flash (MX25L6405D)
Flash Device Information:
CFI Compliant: no
Command Set: Generic SPI Flash
Device/Bus Width: x16
Little Word Endian: no
Fast Bulk Erase: no
Multibyte Write: 256 bytes max
Phys base address: 0xbadf1a5
Uncached Virt addr: 0x1badf1a5
Cached Virt addr: 0x2badf1a5
Number of blocks: 129
Total size: 8388608 bytes, 8 Mbytes
Current mode: Read Array
Device Size: 8388608, Write buffer: 256, Busy bit:
Size Device Device Region
Block kB Address Offset Offset Region Allocation
----- ---- ---------- ----------- --------- -----------------
0 32 0x1badf1a5 0 0 Bootloader (32768 bytes)
1 32 0x1bae71a5 32768 ??? {unassigned}
2 64 0x1baef1a5 65536 0 Permanent NonVol (65536 bytes)
3 64 0x1baff1a5 131072 0 Image1
4 64 0x1bb0f1a5 196608 65536 Image1
5 64 0x1bb1f1a5 262144 131072 Image1
6 64 0x1bb2f1a5 327680 196608 Image1
7 64 0x1bb3f1a5 393216 262144 Image1
.. .. ........
127 64 0x1c2bf1a5 8257536 4063232 Image2 (4128768 bytes)
128 64 0x1c2cf1a5 8323072 0 Dynamic NonVol (65536 bytes)
I want read (on terminal console) a particular regions of flash memory (Perm. nonvol, Dynamic nonvol, Bootloader) use dedicated 'readmem' command
readmem -s 2 -n 16384 0x80001234 (-s format of output, -n bytes to read, 0x.. address to read)
The base address of flash is 80000000.
To obtain an absolute address of each individual block, I added an offset value to the base address.
I.e. for Block #2 (Permanent Nonvol) offset value is 0x00010000 (decimal 65536 to hex). An absolute addresss is 00010000 + 80000000 = 0x80010000
Similarly, for Block #1 an absolute address is 00008000 + 80000000 = 0x80008000.
For Block #0 (bootloader) an absolute address is 0x80000000.
So, to read the full Block #2 (Perm. nonvol) should I read forward 65536 bytes starting from Block #2 absolute address 0x80010000? Or read from previous Block #1 till address 0x80010000?
Same question for block #128 (Dynamic nonvol) with absolute address 0x807F0000: should I read forward 65536 bytes starting from this address,
or read from Block #127 till address 0x807F0000?
Lastly, the same question for reading bootloader.
Flash Device Information:
CFI Compliant: no
Command Set: Generic SPI Flash
Device/Bus Width: x16
Little Word Endian: no
Fast Bulk Erase: no
Multibyte Write: 256 bytes max
Phys base address: 0xbadf1a5
Uncached Virt addr: 0x1badf1a5
Cached Virt addr: 0x2badf1a5
Number of blocks: 129
Total size: 8388608 bytes, 8 Mbytes
Current mode: Read Array
Device Size: 8388608, Write buffer: 256, Busy bit:
Size Device Device Region
Block kB Address Offset Offset Region Allocation
----- ---- ---------- ----------- --------- -----------------
0 32 0x1badf1a5 0 0 Bootloader (32768 bytes)
1 32 0x1bae71a5 32768 ??? {unassigned}
2 64 0x1baef1a5 65536 0 Permanent NonVol (65536 bytes)
3 64 0x1baff1a5 131072 0 Image1
4 64 0x1bb0f1a5 196608 65536 Image1
5 64 0x1bb1f1a5 262144 131072 Image1
6 64 0x1bb2f1a5 327680 196608 Image1
7 64 0x1bb3f1a5 393216 262144 Image1
.. .. ........
127 64 0x1c2bf1a5 8257536 4063232 Image2 (4128768 bytes)
128 64 0x1c2cf1a5 8323072 0 Dynamic NonVol (65536 bytes)
I want read (on terminal console) a particular regions of flash memory (Perm. nonvol, Dynamic nonvol, Bootloader) use dedicated 'readmem' command
readmem -s 2 -n 16384 0x80001234 (-s format of output, -n bytes to read, 0x.. address to read)
The base address of flash is 80000000.
To obtain an absolute address of each individual block, I added an offset value to the base address.
I.e. for Block #2 (Permanent Nonvol) offset value is 0x00010000 (decimal 65536 to hex). An absolute addresss is 00010000 + 80000000 = 0x80010000
Similarly, for Block #1 an absolute address is 00008000 + 80000000 = 0x80008000.
For Block #0 (bootloader) an absolute address is 0x80000000.
So, to read the full Block #2 (Perm. nonvol) should I read forward 65536 bytes starting from Block #2 absolute address 0x80010000? Or read from previous Block #1 till address 0x80010000?
Same question for block #128 (Dynamic nonvol) with absolute address 0x807F0000: should I read forward 65536 bytes starting from this address,
or read from Block #127 till address 0x807F0000?
Lastly, the same question for reading bootloader.
