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39
docs/bootloader.md
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@ -1,30 +1,37 @@
# TREZOR Core Bootloader
TREZOR initialization in split into two stages. See [Memory Layout](memory.md) for info about in which sectors each stage is stored.
TREZOR initialization in split into two stages.
See [Memory Layout](memory.md) for info about in which sectors each stage is stored.
First stage (boardloader) is stored in write-protected area, which means it is non-upgradable.
Only second stage (bootloader) update is allowed.
## First Stage - Boardloader
First stage checks the integrity and signatures of the second stage and runs it if everything is OK.
First stage checks the integrity and signatures of the second stage
and runs it if everything is OK.
If first stage boardloader finds a valid second stage bootloader image on the SD card (in raw format, no filesystem),
it will replace the internal second stage, allowing a second stage update via SD card.
If first stage boardloader finds a valid second stage bootloader image
on the SD card (in raw format, no filesystem), it will replace the internal
second stage, allowing a second stage update via SD card.
## Second Stage - Bootloader
Second stage checks the integrity and signatures of the firmware and runs it if everything is OK.
Second stage checks the integrity and signatures of the firmware and runs
it if everything is OK.
If second stage bootloader detects a pressed finger on the display or there is no firmware loaded in the device,
it will start in a firmware update mode, allowing a firmware update via USB.
If second stage bootloader detects a pressed finger on the display or there
is no firmware loaded in the device, it will start in a firmware update mode,
allowing a firmware update via USB.
## Common notes
* Hash function used for computing data digest for signatures is BLAKE2s.
* Signature system is Ed25519 (allows combining signatures by multiple keys into one).
* Signature system is Ed25519 (allows combining signatures by multiple keys
into one).
* All multibyte integer values are little endian.
* There is a tool called [binctl](../tools/binctl) which checks validity of the bootloader/firmware images including their headers.
* There is a tool called [binctl](../tools/binctl) which checks validity
of the bootloader/firmware images including their headers.
## Bootloader Format
@ -61,7 +68,10 @@ TREZOR Core firmware consists of 3 parts:
### Vendor Header
Total length of vendor header is 84 + 32 * (number of pubkeys) + (length of vendor string rounded up to multiple of 4) + (length of vendor image) bytes rounded up to the closest multiple of 512 bytes.
Total length of vendor header is 84 + 32 * (number of pubkeys) +
(length of vendor string rounded up to multiple of 4) +
(length of vendor image) bytes rounded up to the closest multiple
of 512 bytes.
| offset | length | name | description |
|-------:|-------:|------|-------------|
@ -103,7 +113,10 @@ Total length of firmware header is always 512 bytes.
## Various ideas
* Bootloader should be able to read vendor + firmware header and send info about FW to client in features message.
* Bootloader should be able to read vendor + firmware header and send info
about FW to client in features message.
* Bootloader should not try to run firmware if there is not any.
* Storage wiping rule: Don't erase storage when old FW and new FW are signed using the same key set. Otherwise erase.
* Bootloader should send error to client when firmware update fails and allow client to try one more time. This prevents storage area erasure by accident.
* Storage wiping rule: Don't erase storage when old FW and new FW are signed
using the same key set. Otherwise erase.
* Bootloader should send error to client when firmware update fails and allow
client to try one more time. This prevents storage area erasure by accident.

10
docs/toif.md
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@ -22,7 +22,9 @@ TOI currently supports 2 variants:
### Full-color
For each pixel a 16-bit value is used. First 5 bits are used for red component, next 6 bits are green, final 5 bits are blue, so it looks like this:
For each pixel a 16-bit value is used.
First 5 bits are used for red component, next 6 bits are green,
final 5 bits are blue:
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|----|----|----|----|----|----|---|---|---|---|---|---|---|---|---|---|
@ -30,7 +32,8 @@ For each pixel a 16-bit value is used. First 5 bits are used for red component,
### Gray-scale
Each pixel is encoded using a 4-bit value. Each byte contains color of two pixels, so it looks like this:
Each pixel is encoded using a 4-bit value.
Each byte contains color of two pixels:
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|
@ -40,7 +43,8 @@ Where Po is odd pixel and Pe is even pixel.
## Compression
Pixel data is compressed using DEFLATE algorithm with 10-bit sliding window and no header. This can be achieved with ZLIB library by using the following:
Pixel data is compressed using DEFLATE algorithm with 10-bit sliding window
and no header. This can be achieved with ZLIB library by using the following:
```python
import zlib