mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-25 08:58:14 +00:00
docs: update markdown according to lint
This commit is contained in:
parent
4c183268a8
commit
6b96a91d52
@ -1,30 +1,37 @@
|
|||||||
# TREZOR Core Bootloader
|
# 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.
|
First stage (boardloader) is stored in write-protected area, which means it is non-upgradable.
|
||||||
Only second stage (bootloader) update is allowed.
|
Only second stage (bootloader) update is allowed.
|
||||||
|
|
||||||
## First Stage - Boardloader
|
## 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),
|
If first stage boardloader finds a valid second stage bootloader image
|
||||||
it will replace the internal second stage, allowing a second stage update via SD card.
|
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 - 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,
|
If second stage bootloader detects a pressed finger on the display or there
|
||||||
it will start in a firmware update mode, allowing a firmware update via USB.
|
is no firmware loaded in the device, it will start in a firmware update mode,
|
||||||
|
allowing a firmware update via USB.
|
||||||
|
|
||||||
## Common notes
|
## Common notes
|
||||||
|
|
||||||
* Hash function used for computing data digest for signatures is BLAKE2s.
|
* 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.
|
* 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
|
## Bootloader Format
|
||||||
|
|
||||||
@ -61,7 +68,10 @@ TREZOR Core firmware consists of 3 parts:
|
|||||||
|
|
||||||
### Vendor Header
|
### 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 |
|
| offset | length | name | description |
|
||||||
|-------:|-------:|------|-------------|
|
|-------:|-------:|------|-------------|
|
||||||
@ -103,7 +113,10 @@ Total length of firmware header is always 512 bytes.
|
|||||||
|
|
||||||
## Various ideas
|
## 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.
|
* 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.
|
* Storage wiping rule: Don't erase storage when old FW and new FW are signed
|
||||||
* 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.
|
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
10
docs/toif.md
@ -22,7 +22,9 @@ TOI currently supports 2 variants:
|
|||||||
|
|
||||||
### Full-color
|
### 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 |
|
| 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
|
### 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 |
|
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|
||||||
|---|---|---|---|---|---|---|---|
|
|---|---|---|---|---|---|---|---|
|
||||||
@ -40,7 +43,8 @@ Where Po is odd pixel and Pe is even pixel.
|
|||||||
|
|
||||||
## Compression
|
## 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
|
```python
|
||||||
import zlib
|
import zlib
|
||||||
|
Loading…
Reference in New Issue
Block a user