[PATCH v4 4/5] rpi: Update environment to support booti and large initrd

[Simon Glass]

The existing values don't provide for decompressing an arm64 boot-image.
Add those values and move things apart a bit so that a 50MB kernel can be
accommodated.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v3)

Changes in v3:
- Update the comment block with the new values, including compression

 board/raspberrypi/rpi/rpi.env | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/board/raspberrypi/rpi/rpi.env b/board/raspberrypi/rpi/rpi.env
index 9b9fad82828..9ac9d6768ca 100644
--- a/board/raspberrypi/rpi/rpi.env
+++ b/board/raspberrypi/rpi/rpi.env
@@ -48,28 +48,33 @@ dfu_alt_info+=zImage fat 0 1
  *
  * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
  * conflict with something else. Reserving 1M for each of them at
- * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
+ * 0x05400000-0x05500000 and 0x05500000-0x05600000 should be plenty.
  *
  * On ARM, both the DTB and any possible initrd must be loaded such that they
  * fit inside the lowmem mapping in Linux. In practice, this usually means not
  * more than ~700M away from the start of the kernel image but this number can
  * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
  * parameter given to the kernel. So reserving memory from low to high
- * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
- * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
- * Even with the smallest possible CPU-GPU memory split of the CPU getting
- * only 64M, the remaining 25M starting at 0x02700000 should allow quite
- * large initrds before they start colliding with U-Boot.
+ * satisfies this constraint again. Reserving 1M at 0x05600000-0x05700000 for
+ * the DTB leaves rest of the free RAM to the initrd starting at 0x05700000.
+ * This means that the board must have at least 128MB of RAM available to
+ * U-Boot, more if the initrd is large.
  *
- * Limit bootm_size to 512MB so that all boot images stay within the bottom
+ * For compressed kernels, the maximum size is just under 32MB, with an area for
+ * decompression at 0x02000000 with space for 52MB, which is plenty for current
+ * kernels.
+ *
+ * limit bootm_size to 512MB so that all boot images stay within the bottom
  * 512MB of memory
  */
 bootm_size=0x20000000
 
 kernel_addr_r=0x00080000
-scriptaddr=0x02400000
-pxefile_addr_r=0x02500000
-fdt_addr_r=0x02600000
-ramdisk_addr_r=0x02700000
+kernel_comp_addr_r=0x02000000
+kernel_comp_size=0x03400000
+scriptaddr=0x05400000
+pxefile_addr_r=0x05500000
+fdt_addr_r=0x05600000
+ramdisk_addr_r=0x05700000
 
 boot_targets=mmc usb pxe dhcp
-- 
2.34.1