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Corrected documentation on SPI FLASH memory usage after SPIFFS area extension.

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Piotr Rzeszut 2024-12-29 22:45:50 +01:00
parent e3486e57b1
commit adadfb7fad
3 changed files with 18 additions and 10 deletions
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2
client/src/scripting.c
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@ -283,7 +283,7 @@ static int l_GetFromFlashMemSpiffs(lua_State *L) {
return returnToLuaWithError(L, "No FLASH MEM support");
}
uint32_t start_index = 0, len = 0x40000; // 256kb FLASH_MEM_MAX_SIZE as default value
uint32_t start_index = 0, len = 0x40000; // 256KB FLASH_MEM_MAX_SIZE as default value
char destfilename[32] = {0};
size_t size;

14
doc/ext_flash_notes.md
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@ -19,7 +19,7 @@ External 256kbytes flash is a unique feature of the RDV4 edition.
Flash memory is
* 256KB (0x40000= 262144)
* 256KB (0x40000 = 262144)
* divided into 4 pages of 64KB (0x10000 = 65536)
* 4 pages divided into 16 sectors of 4KB (0x1000 = 4096), so last sector is at 0x3F000
@ -31,6 +31,8 @@ Therefore a flash address can be interpreted as such:
^^^ offset ^^^ offset 0xF7F
```
Please note that for other flash memory sizes than 256KB a "Page 3" will be the last page of the memory, and address offsets would be dependant on the memory size.
## Layout
^[Top](#top)
@ -49,7 +51,7 @@ Page 2:
* to dump it: `mem dump -f page2_dump -o 131072 -l 65536`
* to erase it: `mem wipe -p 2`
Page 3:
Page 3 (or the last page for memories other than 256KB):
* used by Proxmark3 RDV4 specific functions: flash signature, see below for details
* to dump it: `mem dump -f page3_dump -o 196608 -l 65536`
* to erase it:
@ -60,13 +62,19 @@ Page 3:
## Page3 Layout
^[Top](#top)
Page3 is used as follows by the Proxmark3 RDV4 firmware:
Page3 (or the last page for memories other than 256KB) is used as follows by the Proxmark3 RDV4 firmware:
* **RSA SIGNATURE**, see below for details
* offset: page 3 sector 15 (0xF) offset 0xF7F @ 3*0x10000+15*0x1000+0xF7F=0x3FF7F (decimal 262015)
* length: 128 bytes
* offset should have been 0x3FF80 but historically it's one byte off and therefore the last byte of the flash is unused
* **Reserved for future use**
* offset: page 3 sector 14 (0xE)
* **SPIFFS sectors**
* offset: page 3 sectors 13..0 (0xD..0x0)
## RSA signature
^[Top](#top)

12
include/pmflash.h
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@ -22,17 +22,17 @@
#include "common.h"
// RDV40 Section
// 256kb divided into 4k sectors.
// 256KB divided into 4K sectors.
// +--------+-------------+---------+--------------------------+
// | Sector | 256kb addr* | Size | Description |
// | Sector | 256KB addr* | Size | Description |
// +--------+-------------+---------+--------------------------+
// | N | 0x3F000 | 1 * 4kb | signature |
// | N-1 | 0x3E000 | 1 * 4kb | reserved for future use |
// | N | 0x3F000 | 1 * 4KB | signature |
// | N-1 | 0x3E000 | 1 * 4KB | reserved for future use |
// +--------+-------------+---------+--------------------------+
//
// * For different memory size than 256kb the address is not valid.
// * For different memory size than 256KB the address is not valid.
// Please instead refer to Sector number, where N is the last
// 4kb secotr of the memory in question.
// 4KB secotr of the memory in question.
#ifndef FLASH_MEM_BLOCK_SIZE
# define FLASH_MEM_BLOCK_SIZE 256