| Message ID | 20240519094106.2142896-1-rayhan.faizel@gmail.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Initial support for One-Time Programmable Memory (OTP) in BCM2835 | expand |
On Sun, 19 May 2024 at 10:42, Rayhan Faizel <rayhan.faizel@gmail.com> wrote: > > All BCM2835 boards have on-board OTP memory with 66 32-bit rows. Usually, > its contents are accessible via mailbox commands. > > [Changes in v3] > > - Forgot to replace constant with macro in one particular spot. > > [Changes in v2] > > - Replace read/write with get/set in bcm2835_otp.c. > - Use impl instead of valid in bcm2835_otp.c. > - Replace all constant values with macros defined in bcm2835_otp.h. > - Change memory region size of OTP device to 0x80. > - After further testing on a real Raspberry Pi 3, I noticed a few things > contrary to my initial assumptions: > -- The customer OTP lock bit is bit 6 of row 32, NOT bit 30 of row 30. This is > currently undocumented to my knowledge. > -- The above lock indeed applies to the private key as well. > > Rayhan Faizel (3): > hw/nvram: Add BCM2835 OTP device > hw/arm: Connect OTP device to BCM2835 > hw/misc: Implement mailbox properties for customer OTP and device > specific private keys Applied to target-arm.next, thanks. -- PMM
Hi, The patch series is still not merged. On Thu, May 30, 2024 at 6:57 PM Peter Maydell <peter.maydell@linaro.org> wrote: > > On Sun, 19 May 2024 at 10:42, Rayhan Faizel <rayhan.faizel@gmail.com> wrote: > > > > All BCM2835 boards have on-board OTP memory with 66 32-bit rows. Usually, > > its contents are accessible via mailbox commands. > > > > [Changes in v3] > > > > - Forgot to replace constant with macro in one particular spot. > > > > [Changes in v2] > > > > - Replace read/write with get/set in bcm2835_otp.c. > > - Use impl instead of valid in bcm2835_otp.c. > > - Replace all constant values with macros defined in bcm2835_otp.h. > > - Change memory region size of OTP device to 0x80. > > - After further testing on a real Raspberry Pi 3, I noticed a few things > > contrary to my initial assumptions: > > -- The customer OTP lock bit is bit 6 of row 32, NOT bit 30 of row 30. This is > > currently undocumented to my knowledge. > > -- The above lock indeed applies to the private key as well. > > > > Rayhan Faizel (3): > > hw/nvram: Add BCM2835 OTP device > > hw/arm: Connect OTP device to BCM2835 > > hw/misc: Implement mailbox properties for customer OTP and device > > specific private keys > > > > Applied to target-arm.next, thanks. > > -- PMM
On Mon, 24 Jun 2024 at 10:12, Rayhan Faizel <rayhan.faizel@gmail.com> wrote: > > Hi, > > The patch series is still not merged. Oops, sorry about that -- not sure how it got lost. I have applied it to target-arm.next for real this time... -- PMM
No worries, and thanks! On Mon, Jun 24, 2024 at 3:52 PM Peter Maydell <peter.maydell@linaro.org> wrote: > > On Mon, 24 Jun 2024 at 10:12, Rayhan Faizel <rayhan.faizel@gmail.com> wrote: > > > > Hi, > > > > The patch series is still not merged. > > Oops, sorry about that -- not sure how it got lost. I have > applied it to target-arm.next for real this time... > > -- PMM
All BCM2835 boards have on-board OTP memory with 66 32-bit rows. Usually, its contents are accessible via mailbox commands. [Changes in v3] - Forgot to replace constant with macro in one particular spot. [Changes in v2] - Replace read/write with get/set in bcm2835_otp.c. - Use impl instead of valid in bcm2835_otp.c. - Replace all constant values with macros defined in bcm2835_otp.h. - Change memory region size of OTP device to 0x80. - After further testing on a real Raspberry Pi 3, I noticed a few things contrary to my initial assumptions: -- The customer OTP lock bit is bit 6 of row 32, NOT bit 30 of row 30. This is currently undocumented to my knowledge. -- The above lock indeed applies to the private key as well. Rayhan Faizel (3): hw/nvram: Add BCM2835 OTP device hw/arm: Connect OTP device to BCM2835 hw/misc: Implement mailbox properties for customer OTP and device specific private keys hw/arm/bcm2835_peripherals.c | 15 ++- hw/misc/bcm2835_property.c | 87 +++++++++++++ hw/nvram/bcm2835_otp.c | 187 +++++++++++++++++++++++++++ hw/nvram/meson.build | 1 + include/hw/arm/bcm2835_peripherals.h | 3 +- include/hw/arm/raspberrypi-fw-defs.h | 2 + include/hw/misc/bcm2835_property.h | 2 + include/hw/nvram/bcm2835_otp.h | 68 ++++++++++ 8 files changed, 363 insertions(+), 2 deletions(-) create mode 100644 hw/nvram/bcm2835_otp.c create mode 100644 include/hw/nvram/bcm2835_otp.h