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Change chainloader relocation to 256 MiB

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This should accommodate devices with less than 1 GiB.
This commit is contained in:
Andre Richter 2020-04-08 23:29:21 +02:00
parent ed5cada47e
commit 26b23eb486
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GPG Key ID: 2116C1AB102F615E
4 changed files with 15 additions and 14 deletions
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25
07_uart_chainloader/README.md
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@ -57,25 +57,26 @@ kernel.
The `Makefile` in this tutorial has an additional target, `qemuasm`, that lets
you nicely observe the jump from the loaded address (`0x80_XXX`) to the
relocated code at (`0x3EFF_0XXX`):
relocated code at (`0x1000_0XXX`):
```console
$ make qemuasm
[...]
IN:
0x00080990: d0000008 adrp x8, #0x82000
0x00080994: 52800020 movz w0, #0x1
0x00080998: f9416908 ldr x8, [x8, #0x2d0]
0x0008098c: b0000008 adrp x8, #0x81000
0x00080990: b0000000 adrp x0, #0x81000
0x00080994: 912a8000 add x0, x0, #0xaa0
0x00080998: f9471908 ldr x8, [x8, #0xe30]
0x0008099c: d63f0100 blr x8
----------------
IN:
0x3eff0b10: d0000008 adrp x8, #0x3eff2000
0x3eff0b14: d0000009 adrp x9, #0x3eff2000
0x3eff0b18: f941ad08 ldr x8, [x8, #0x358]
0x3eff0b1c: f941b129 ldr x9, [x9, #0x360]
0x3eff0b20: eb08013f cmp x9, x8
0x3eff0b24: 540000c2 b.hs #0x3eff0b3c
0x10000b1c: b0000008 adrp x8, #0x10001000
0x10000b20: b0000009 adrp x9, #0x10001000
0x10000b24: f9475d08 ldr x8, [x8, #0xeb8]
0x10000b28: f9476129 ldr x9, [x9, #0xec0]
0x10000b2c: eb08013f cmp x9, x8
0x10000b30: 540000c2 b.hs #0x10000b48
[...]
```
@ -252,8 +253,8 @@ diff -uNr 06_drivers_gpio_uart/src/bsp/raspberrypi/link.ld 07_uart_chainloader/s
{
- /* Set current address to the value from which the RPi starts execution */
- . = 0x80000;
+ /* Set the link address to the top-most 40 KiB of DRAM (assuming 1GiB) */
+ . = 0x3F000000 - 0x10000;
+ /* Set the link address to 256 MiB */
+ . = 0x10000000;
+ __binary_start = .;
.text :

BIN
07_uart_chainloader/kernel
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07_uart_chainloader/kernel8.img
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4
07_uart_chainloader/src/bsp/raspberrypi/link.ld
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@ -5,8 +5,8 @@
SECTIONS
{
/* Set the link address to the top-most 40 KiB of DRAM (assuming 1GiB) */
. = 0x3F000000 - 0x10000;
/* Set the link address to 256 MiB */
. = 0x10000000;
__binary_start = .;
.text :